Re: Mini FM transmitter as a signal booster.
I once rigged up an internal rebroadcast antenna coupled to an external one via an amplifier to improve a poor signal inside a depot where vehicles had to receive data on VHF high band and no one was more surprised than me when it worked. The aerials were well spaced and isolated so no problems with instability occurred. It's probably still there, doing it's obsolete job if no one has discovered where to switch it off yet!
Alan.
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