I'm reminded of my first cordless phone, mid 1980s.
These had a downlink just below the medium waveband, about 1.7 Mhz, radiated from the base station by a trailing wire antenna and picked up in the handset by a ferrite rod. The uplink, about 50MHz iirc, was by a short telescopic antenna in both handset and base station. The limiting factor affecting range always seemed to be the low frequency downlink.
I wanted mine to work at the pub about 200yds up the road, way beyond its normal capability. But by loosely winding the base station's trailing antenna wire around the BT phone line, enough RF seemed to be coupled that the BT lines served to distribute the signal all along the road, and I could make and receive calls from the pub. That was pretty cool, pre mobiles, early 80s.
Not entirely sure how legal or illegal it was, and not sure how many neighbours got my phone calls breaking through on their HIFis, privacy wasn't something we worried about then.