In areas with mountainous terrain it's common practice to operate low power transmitters called 'translators'. These transmitters serve areas that would be blocked by the terrain. Often, you can see quite a bit of detail about a translator, who operates it and what network it's affiliated with, at
www.rabbitears.info
For example, the signal from KDRV (ABC) is carried on the translator licensed as K36HM-D.
http://www.rabbitears.info/market.ph...=K36HM#station By using a unique call sign for each transmitter, the FCC is able to identify each licensed transmitter individually. However, if you receive the signal from K36HM-D, you'll see it identify the programing as originating from KDRV and at times, you'll see them mention their translator(s) to satisfy FCC regulations re. station identification.