I have never tried it, but I would really doubt would work through metal. My cell phone gets no signal in the glove box of my old cars. I live with out a radio an all my old GMCs, but I bought some after market radios for my 56 Ford cars. They aren't exactly original looking, but they do fit the holes and work about like a new factory radio in a pickup. Back in the 60's when transistor radios became of age, I used to hang a radio under the dash. They didn't show that much, and a few extra holes under the dash didn't hurt anything.
