But, wait... there's more!
So you've made your decision and placed an order for a radio. You're not out of the woods yet. Now you need to purchase an antenna, a cable to connect it to your radio, and--depending where/how you intend to install the antenna--perhaps a mounting bracket. Let's start at the top.
Choosing an antenna
While there are many different styles of antennas that can work, I am going to simplify this part of my recommendation and narrow down your choices to two general (dual-band) designs: a 1/4 wave 2m type (which will be around 18" tall) or a 1/2 wave 2m type (which will be around 36" tall). The mathematical genius hams will endlessly discuss the differences between these designs, and they'll tell you how the output patterns differ. While they would be exactly correct, let me save you the trouble: if at all possible, choose the taller 1/2 wave design. Having run both types, I have enjoyed better performance with the 1/2 wave than I have with a 1/4 wave... and I think the majority of people across the country would have a similar experience.
Just like I suggested with the radio, I will also recommend you select a quality brand antenna. Here, however, I will go further and recommend a specific 1/2 wave model: the Larsen NMO-2/70B. Reasonably priced at $70 at HamRadio.com, this antenna offers proven performance and ruggedness. Even if your radio only operates on 2m, buying a dual-band antenna is still a wise choice. If you ever change your mind in the future and upgrade to a dual-band radio--like I did--you'll already have the antenna for it.
If for some reason you absolutely cannot fit a 1/2 wave antenna, only then should you choose a smaller 1/4 wave antenna. Yes, this will save you a little money... but consider this: the antenna (and its installation) is the single most important part of any ham radio system! This is where spending a few extra dollars will greatly increase your radio's performance, and it really is worth the stretch. An old ham radio rule of thumb states: a poor radio with an excellent antenna will outperform an excellent radio with a poor antenna. Once again, don't be that guy. Unless it is absolutely impossible, use a Larsen NMO-2/70B 1/2 wave antenna. Trust me.
There is one more aspect about the antenna you must decide: how will it attach to your car? You have two choices: a permanent mount antenna, or a magnet-mounted antenna. A permanent mount antenna will have a threaded fitting at the bottom; it must be screwed onto a matching antenna mount. A mag mount antenna will have a large base with a magnet at the bottom, allowing one to simply plop it onto the car's sheet metal.
Once again, I'll get right to the point: mag mount antennas are for temporary use only... and by temporary, I mean a time span of a few days at the very most. If you're going to leave the antenna in place longer than that--and that's the whole point of this web page--then you do not want to use a mag mount. Instead, get a proper antenna and a proper mount and attach it to your car in the proper fashion. There are a few different mount types; the one you want is called an NMO mount.
Depending where you mount the antenna, this might mean drilling a small hole in your car. Upon hearing this, new hams typically gasp, "are you kidding?!? There is no way I'm going to ruin my car in such a manner! I'll just use a harmless mag mount antenna instead." I've got news for you: magnet mounts are not harmless. They are exactly the opposite, in fact. Over time, a magnet mount will move around a bit. Even worse, a magnet mount allows for tiny dirt particles to get between the magnet and your car's sheet metal... and then when the magnet moves slightly, these particles act like sandpaper and chafe the finish. After just a few months, there will be a permanent scar which will require professional paint work to repair. If you shy away from drilling a hole because you don't want to cause permanent damage, or you're worried about a loss of future resale value, using a mag mount is not the answer... so why not just install a proper NMO mount? If you ever do sell the car, just remove the antenna (but leave the cable and mount) and then tell the next buyer the car is pre-wired for a two-way radio. In all probability, they won't even care.
There is an even more important reason to avoid a mag mount antenna: the cable. If you plop a mag mount antenna on your car's exterior, you've got to get its attached cable into your car's interior. This inevitably means you run it through a trunk opening, or a hatchback opening, or a door opening. In all these cases, that means the cable will be crushed slightly every time the trunk/hatch/door is closed. As it turns out, coax cable hates being crushed. Do it often enough over time and the internal antenna wire will be compromised... until it finally breaks (or shorts). This won't seem like a big deal until the next time you key up your radio; trying to transmit without an antenna attached will usually cause internal failure of a ham radio. In this scenario, you'd have to buy a new antenna and a new ham radio.
Once again, don't be that guy! Route the cable properly into your car's interior. In most cases, this will involve drilling a small hole somewhere on your car. And since you're going to be doing that anyway, why not just purchase a proper NMO antenna mount and attach a proper antenna to it?
Proper antenna placement
Now that you have a proper NMO antenna, you need to install it on your car. But where? This is actually extremely important, because where you mount your antenna will greatly influence its effectiveness. In order from best to worst performance, here are three locations for you to consider:
-center of the roof
-center of the trunk lid
-on either front fender
For many reasons, the center of the roof is by far the best place to install your antenna. Some cars might not allow this location due to having a power sunroof, or rear air conditioning, or maybe even because of the side curtain air bags. If the roof is a no-go, your next-best option is the center of the trunk. Best results will again require drilling a hole, but don't let this scare you--I did it to my car, and you can do it to yours, too. Because that car had a power sunroof, I had to skip the rooftop mounting option and thus I went for the trunklid. I chose a small 1/4 wave antenna because, at the time, I thought it didn't matter very much (I was still learning). This antenna arrangement did indeed seem to work fine, so I was happy... until the day I did a side-by-side test with my Jeep. (More on that in a minute.)
But what if your roof option is out and you cannot mount your antenna on the trunk? For example, maybe your car is a hatchback or an SUV which doesn't have a trunk at all. In that case, you can look at your third and final option, one of the front fenders. I had to do this on my Wrangler, because (1) it has no roof and (2) it has no trunk lid. Since my Jeep does have a small piece of horizontal fender steel, I decided to drill a hole and mount the antenna there.
It is common for Jeeps to mount the antenna much closer to the windshield. I decided to push mine out and keep it as far away from the windshield frame as possible. My thought process was simple: I wanted to minimize the windshield "blocking" the antenna's output. To date, this setup has proven to perform very well. As an added bonus, the flexible nature of this antenna has not caused any problems when it contacts tree branches, nearby rock walls or overhangs, etc when I am out Jeeping.
And now a word on performance. After installing the FT-7900R in my Jeep and then later upgrading my commuter car's radio to another identical FT-7900R, I gradually began realizing that the Jeep's radio performed better--it seemed to hit distant repeaters with a better/stronger signal than my car's radio did. I eventually did a side-by-side test in my own driveway, wherein I observed a need to increase my car's radio output power so it could hit repeaters that my Jeep's radio could hit on low power output. The only differences between the two vehicles were the antenna style used (1/2 wave verses 1/4 wave, with the Jeep being better) and its location (trunk lid verses fender, with the car being better). Long story short, this is when I became a big fan of using a 1/2 wave antenna rather than a 1/4 wave, and that's why I made this same recommendation to you.
Back to fender mounting an antenna. Most of you won't have flat fenders on your car like my Jeep. In the majority of cases, mounting an antenna at a front fender will require a bracket attached to the fender channel. This is how I had to setup my Suburban, since the rear A/C eliminated the roof as an option and there is no trunk. Due to their common use by law enforcement, my Suburban has a vehicle-specific bracket that I found. If your car isn't commonly used by the cops and thus you can't find a custom bracket for it, don't fret. Just get a universal one.
Depending which exact mount you choose and where you buy it, it will only cost you around $10-$15. One last word of advice: if you're going to mount your antenna on a bracket rather than directly in the center of a flat piece of steel--in other words, if you're mounting it on a fender rather than on the trunk lid or the roof--then make sure you only use a 1/2 wave antenna. The performance of a shorter 1/4 wave antenna is significantly compromised if it is not sitting in the center of a flat piece of steel; taller 1/2 wave antennas seem to be more forgiving in this regard.
Antenna cable
Now that you have an antenna (and a bracket, if needed), the last item you need is the cable to connect the antenna to your radio. You can easily find NMO-style cables where you buy your radio; just ask them for RG58 cable (not RG58/U). A 17-foot cable will typically cost you about $20. Some cables have the radio-end fitting (called a PL-259 connector) already attached; others ship with this connector loose in the bag and require you to attach it to the cable with a soldering iron. It is actually an advantage to attach the connector yourself, for two reasons. First, it is easier to route the skinny RG58 cable through a hole in the firewall than it is with the large connector already on the cable. Second, if the connector is not yet installed then you can easily cut the cable to length and thus avoid having lots of excess antenna cable (which is undesirable for multiple reasons I won't go in to now).
Have you never used a soldering iron in your life? If not, now's your chance to learn how to use one! Seriously, it is very simple to attach the connector to the cable; you can find a number of YouTube videos which show just how easy it is. If you watch a video and you're still worried, I'm sure you can find a local ham who would be willing to assist you.
That's about all you need to know to purchase a quality ham radio system for your car. I hope to hear you on the airwaves someday!