Hi,
Well the last time I had radiorecepition in my gear was when I was was rehearsing on top of the Islandic/Yuguslavian Friendship Association and could tune between Radio Moscow and Radio Luxemburg via the volume and tone controls on my guitar and the wha wha....and only when I wasn't playing....
Now there's no difference in sheilding capabilities of the boxes used for MGMV and SMBV and yes I do know how to build a radio allthough it was very many years ago I went through radio repair course
Right, let's see to fully vaccinate one would have to look at the whole system and see also specific grounding where antennas can be created and how one can disturb them
As a funny note my local submarine engineer would say about using single coil pick ups that those are inferior and have a lot of problems picking up disturbances, but then when he plays music he's bassist;)
He'd have these examples that he'd qoute hehehe
Another fun thing is something Scott Henderson told me about why he changed pick ups on his strat to humcancelling: he said that after 9/11 radio masts got significantly lower and radio interference when gigging got a lot worse in NYC to intolerable and then he also said he'd wired a tone for the bridge pick up and told what the LA people said onto eachother 'Tone On Two' meaning set tone on two for thicker tone
Not above how you can tune antennas when created.
Also some spots are more prone to disturbances and then one must be very thourough or move position.
Oh yes one can eliminate disturbances if one can access to the whole system and run the system in an environment that is prone to disturbances and one can isolate.
Have fun
BJ