Your garage should be loaded with radio stuff and the car outside where it's safe.
Hey thats what I do
Garage became the antenna maint. shed a few years ago and is also home to some tools and spare parts.
Actually AM audio into consumer solid state stuff is common. Speakers, diodes and cables all act in concert to become something like a boy's crystal set receiver. I get into the neighbor's land line (glad they use cell phones) and used to come out of their solid state stereo even when it was turned off. Wrapping up the speaker wires and putting torroids at the back of the audio amp fixed that. This is partly why I run tube audio in the shack with plate to speaker transformers.
Switching supplies seem to pass rf on the power cables and house wiring right into the appliance whereas before a linear supply's step down transformer would stop it. This is fundamental diode rectification of your AM signal so the solution is to do the usual stuff with ferrite cores and shunt caps to ground but that last part may not work with these cheap plastic gadgets.
Given that at my place these things give me so much RFI misery on 75 and 160 receive, I do not loose much sleep over causing interference (this is a character flaw and not an example for others
).
Tom, I'm surprised you don't get into your computer speakers etc. Your antennas must be far away from your house.
Rob