Basically whenever a taxi goes past my apartment and receives a message, I
get a loud thumping sound from my subwoofer. I initially thought it was the
subwoofer itself picking up the noise, but since I bought a wireless network
transmitter which is plugged in on the same loop, it resets itself at the
same time as the sub clicks.


Youre wireing is being an ariel and picking up the VHF/UHF FM which the
only amplitude change is the carrier turning on or off. Thats the thump.