Hi - I did that a long time ago and I forget what the capacitance worked out to be (not much, I think I guessed the glass was 1/8 inch..) But it was a random wire antenna driving a shortwave RX and it worked adequately without further "maths"... I guess you could also use it for transmitting where that series C should be taken into account as part of the complex system Z. Mr Smith enters the chat....

I think I remember that there were some older cell phone antennas for window mounting that used the same idea to couple the signal thru the rear window glass... cool but not rocket science... Improvise, Adapt, Overcome...

Tim

N6CC

On Thu, Jan 11, 2024 at 6:20 PM Hubert Miller <Kargo_cult@msn.com> wrote:

Tim, that reminds me. Besides the copper tape i still have, i also have a glass plate that i intended for a crystal
regrinding project. I'm thinking i can measure the capacitance between copper tape on each side. I should do
this. I am intrigued that this actually allowed SWL reception, altho of course the small capacity rules that the
antenna impedance must be high. As for car windows, the most likely candidate, the rear window, usually has
in-glass wiring for defrost. ( There was one car radio, the Carver TX-9, that used this rear window defrost wiring
for one antenna for space - diversity FM reception. Unfortunately, Eton, a usually reliable maker, really fouled
up the cassette drive mechanics, and Carver recalled all they had sold. ) ( These Carver car radios showed up
years later at a Bellevue, WA electronics store, Vetco. )
-Hue Miller
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