I don't know but maybe you can burry the line underground.
I had an old wireless headphone with infrared transmition ( not radio like nowadays but infrared light ) and i wanted to test the reciver. I don't remember why but I put it right to the telephone plug... and I heard something coming "from" the line. It was LW radio "France Inter", the transmitter is at 80km from my town. But maybe the sound comes not from the telephone line but the infared receiver, but i remember i put it along the line and have radio
One day I had German radio through my guitar amp !
It was very weird. This amp has no radio on it, and suddently voices comes out
Someone told me he have the same story too.
Some weeks ago, analog TV was shut down, and all the night I was trying to see what appens. So i had my little black and white analog TV, and I wantend to recieve a farest transmitter wich is still active in another region.
And I have some pictures from it, but in the middle of the UHF band I have FM radios !!!
and the sound was clear.
Well, i guess radio is just everywhere