See http://www.tvtechnology.com/dlrf/one.php?id=259


"Corridor Systems sent an Open letter to the FCC
http://www.corridor.biz/031201-fcc-letter.pdf regarding ARRL's
opposition to BPL. In the letter, Glenn Elmore, Chief Technology
Officer, who also holds Amateur Radio call sign N6GN, said, "Corridor
Systems has demonstrated a BPL technology which is completely compatible
with the Amateur Radio Service and, indeed, with all users of the HF-VHF
spectrum, one which can be operated completely within Part 15
guidelines, is compatible with other services and is an excellent
cohabitant of the public spectrum." During the 216 Mbps BPL test using
2.4 GHz and 5.3 GHz ISM/Part 15 spectrum, the letter said "Corridor
Systems demonstrated normal system operation, maintaining high dynamic
range, in spite of the presence of a high-level, 2.4 GHz fixed wireless
transmitter located approximately 1/2 mile and within line-of-sight of
the BPL system and sharing common spectrum."

"These results indicate there is no reason for the FCC to allow high
frequency based broadband over power line systems when an alternative
exists that offers greater bandwidth and no threat to existing HF, VHF
and UHF spectrum users. Users of the 2 to 20 GHz spectrum may have some
concerns and these should be addressed, but if G-line technology or a
later refinement of it is being used, as appears likely, there should be
little radiation from the power lines.