Because they don't operate in the UHF bands' frequencies. https://en.wikipedia.org/wiki/Broadband_over_power_lines#Implementation https://en.wikipedia.org/wiki

Because they don't operate in the UHF bands' frequencies. https://en.wikipedia.org/wiki/Broadband_over_power_lines#Implementation https://en.wikipedia.org/wiki/Broadband_over_power_lines#Imp... says "0-30MHZ" (that's the HF bands) "and sometimes as high as 80Mhz" (50Mhz would be 6-meters)