Power-line telecommunications (PLT) means the use of existing electric power lines (mains wiring) for broadband communications purposes. To achieve data rates of the order of tens of megabits per second, a frequency range up to tens of megahertz (typically, 30 MHz) is used. Electric power cables (mains cables) were not originally designed to carry broadband communication signals and actually have a configuration and layout that cause them to act as antennas at high-frequency (HF; 2–30 MHz) radio frequencies. Therefore, there is potential for interference to HF radio systems near a PLT installation, as well as at large distances due to cumulative contributions from a large number of PLT installations.