On rarer occasions, they may also air a very limited amount of distinct programming from their parent station.

A translator or booster must go off the air if the parent station's signal is lost.

Boosters must not interfere with the parent station within the community of license.

This often meant that the parent station was no longer receivable over-the-air at the relay site.

Additionally, the satellites usually air separate local commercials from those of the parent station.

A majority of Internet broadcasts have yet to contribute substantial revenue to the parent stations, broadcasters say.

It was abandoned in 1941, as it was considered too close to the parent station to be developed further.

Boosters are licensed on the same frequency as the parent station but at a different location.

They are given the same callsign as the parent station with a number added to differentiate the transmitter site.

Thus, they are no longer technically "cable only" and must now use the parent station's licensed callsigns instead of a fictional one.