imac g5 radio interference and other elecrical interference

I was wondering if anyone could help. i have recently upgraded my old snow white g3imac to a new g5 intel processor imac as it was needing renewing as none of the new software would run on it and it was becoming obselete. i've had my new mac about a month now and it seems to get constant interference from foreign radio stations that can be heard clearly in the backgoud. this can get fairly loud and is doing my swede in. I did have the intention of using the mac with logic for music but things aren't looking good. does anyone have any advice to offer please.