Matt's major point is that the guys with the money seem to able to get the FCC to do what they want. Recently, the incumbent carriers (Verizon, SBC, etc.) have been able to get their way regarding access to local telephone loops for broadband.

This leaves the internet service providers with the problem of getting their signals to the residences and businesses they want to serve. Everyone has power wiring, so that would seem attractive, since it's not owned by the cable or telephone companies. I can see why the FCC might want to allow BPL to restore the competitive broadband environment, fending off criticism regarding the favouring of the few big incumbents which generally are seen to have a monopoly in their service area.

Even so, I'm with some of the others here. R/C signals are generally quite strong at the receiver, so raising the noise floor isn't going to make a big difference. If you have low voltage power wires on your field boundaries, far from the pilot stations then there might be a problem if you get close. If are that close, you'll be hitting the wires or poles fairly often.

I don't imagine that HV distribution wires will have BPL on them. It will be the local 110 V wiring, terminated at residences. So if you see significant amounts of BPL RF noise you are probably pretty close to a residential area. Probably close enough for the locals to be complaining about engine noise.

Low band VHF two-way radios, as used by police, fire brigades, etc. are at more risk. They have to operate in suburban areas, and over large areas. Of course, they have the option of moving to UHF, if the city can afford to replace all their radios.