Behold, my friends--the great experiment.
I am in this less than $5; I only needed to purchase wood screws, washers and some heat shrink tubing. Home Depot gave me a piece of scrap 2x4 they were going to discard; my brother-in-law gave me a spare balun he had (which Amazon sells for $4), and I scrounged up half a dozen unpainted metal coat hangers. Even if you need to buy the balun, you're still gonna be out less than $10.
I decided to go for proof of concept first; if this thing works, I figured I'd sand and paint it to make it more attractive later (which I still have not done LOL).
I merely propped it up on a speaker in the corner of my living room, connected it, and scanned for channels.
After a few minutes, the TV had found 20-something and finished. That sounded a little disappointing... until I decided to tune through them and see the actual result. Since most stations transmit multiple digital signals 'sandwiched' together on each frequency, I actually ended up with 70 distinct, viewable channels! Some were duplicates (from different sources), some were in Spanish, and there were four or five shopping channels; even if I ignore all those, I am still left with about 50 channels... all for free.
Here are two images I used to design and build my antenna:
The first photo told me how to space the holes in the board (though I decided to move the middle holes inward a bit, like in the second picture). The second picture told me how to shape/size the metal pieces. I did use a grinder to scuff the hanger surfaces everywhere they contacted each other and/or they contacted a washer, just to ensure a good electrical connection. Note that heat shrink is used to
prevent electrical contact at the two crossover points. But that's really all there is to it.