Low Power Television -  (Low Power Broadcasting, LPTV, Low Power Television Service, LPB) - (May be known as Micropower Broadcasting, Microbroadcasting) - This includes radio broadcasting as well as TV broadcasting.  LPTV stations can provide their communities with local programming, and event/issue coverage in a smaller area than many TV stations. In July, 1999, in the States there were 2,190 LPTV licenced stations.  As LPTV signals are comparatively weak, LPTV stations don’t generally interfere with larger TV stations using the same frequency.  LPTVs don't always license themselves which could be an issue. http://en.wikipedia.org/wiki/LPTV

Example: http://www.panamericatv.com