Okay, I think I should have listened to CDDrive's advice a few posts back and just give up on VHF and FM for now. Well at least now I have a knowledge base for when I want to go back to VHF and FM. Also, when I build VHF/FM receiver, since it has to be permanent because the wires need to be as short as possible and use soldering, I will build a super regen receiver because that will provide much better results for VHF/FM than a crystal set without the disadvantages of the regen receiver. The guy on the website who built an FM crystal set, he lives in downtown Phoeniz, AZ so of course he picked up FM stations, but me living 40 miles outside of Chicago I would probably only pick up the local FM station 5 miles from my house Star 105.5 that is already picked up by my guitar as the loudest FM station (and almost always the only FM station, depending on weather conditions and time of day, on a clear night at 3AM the guitar with guitar amp connected to an audio interface can record audio from the only classical station in Chicago which is 40 miles away) that is as loud as WBBM. So FM crystal sets do work, but you have to pretty much live in an urban area 5 miles away from the transmitter to pick up any stations so FM crystal sets are not as practical as MW crystal sets and the super regen receiver is a much more practical way of receiving FM/VHF from farther away.
So now I want to work up to building an FM/VHF super regen receiver at a later time by starting with an MW regen receiver and later a MW super regen receiver. WBBM should come in ear bleeding loud with the output jack of the MW regen receiver connected to the Hi-Z input jack of the guitar amp. Star 105.5 will also likely come in ear bleeding loud all over the tuning spectrum because of slope detection since the transmitter is so close. Farther away MW stations (and likely some close FM stations too by slope detection) should come in with the MW super regen receiver.
So bottom line, if you have horses as your next door neighbors (which I do), you probably live too far away from FM transmitters in urban areas for an FM crystal set to work.
So here is my MW regen schematic design attached below. The coil form is a 18 inch x 18 inch x 16 inch moving box to make the winding easier since less coils are needed and also now I don't even need an aerial because the coil is the antenna. Just like the coil was the antenna for the MW super het receiver project that I posted earlier. I would need to make my current variable capacitor (still only partially assembled) much bigger.
To make sure that I'm doing it right, I'll continue to build the VHF variable capacitor and when its complete I'll take photos of it so you can tell me if I built it correctly, so that way I will waste less materials on messing up on a small variable capacitor rather than a huge variable capacitor.
Edit: Now that I think about it, FM crystal set is very doable for only receiving the local station 5 miles away as long as I remove the indoor antenna from the schematic entirely and put the coax feedline from the dipole aerial direct to the alligator jumper cable direct to the VHF inductor. It is not optimized because the wire connections are too long and its not soldered, but if even a guitar can pick up that station I should be able to pick up that station. Also now that I think about it, I don't think I even need to build a new huge variable capacitor, because if you look at any clock radio super het you will see that the same variable capacitor is used for both AM and FM! So I can use the same variable capacitor for both AM and FM crystal set with the only difference being the antenna/inductor (inductor is antenna for AM).
Here I drew a new schematic design for AM/FM crystal set attached below.
Edit 2: You know what, I think MW is just fine to start out with to test if everything is working before even testing the variable capacitor, and to later test the capacitor, instead of adding an unknown into the circuit (FM is the unknown).
To receive WBBM, if I can receive it on my guitar, I'm sure I don't even need a variable capacitor to receive it!
So before I build the MW crystal set with no variable capacitor, I need to buy is a minimum of (20)(18 inch x 4) of speaker wire = 1440 inches speaker wire = 120 feet speaker wire. In order to add a little bit extra for a little antenna to dangle a few feet off of the coil and for the ground connection wire to dangle a few feet and several extra feet in case I mess up, I should buy 150 feet speaker wire.
I also need to buy the alligator jumpers and the output jack.
On Amazon, total bill for MW crystal set with no variable capacitor and no aerial should be:
(1) magnet wire 22 gauge 200 feet
http://www.amazon.com/Magnet-Wire-A...1367904238&sr=8-7&keywords=magnet+wire+22+awg
$5.99
(2) alligator jumper cables, 10 pack
http://www.amazon.com/SE-TL10-Clip-...=1367894939&sr=8-4&keywords=alligator+jumpers
$4.59
(3) guitar output jack
http://www.amazon.com/Electric-Guit...1367895038&sr=8-7&keywords=output+jack+guitar
$2.39
Total before sales tax, shipping, and handling: $12.27