Of course if the consumer KNEW what they really needed to, they might
demand that the things be properly engineered and manufactured in the first
place!



As Beavis and Butthead are fond of saying: "You can't polish a turd".
There's no way to
make BPL using HF and VHF frequencies not QRM licensed users of those
frequencies.
Even microwave BPL is going to goof someone else up. Except maybe put
them on the
same frequency as that used by all the microwave ovens...