During a few listening sessions, I have noticed that when I can hear the television turn on in the apartment below me, local interference becomes much louder. Have any of you dealt with this issue in the past? Which component generates the interference - the wiring, the cable box, or the television? What remedies can I propose to my neighbors?

I'm using portable radios (Sony ICF SW7600GR, Eton E5, Kaito 1102) with the whip antennas, and typically the antennas are oriented horizontally.