Simplify the following text for a Grade 7 native English-speaking person.
Original: As digital television expands and as analog television is being phased out by December 2012 , RTÃ broadcasts several digital only television channels . These include RTÃ Two HD , RTÃ News Now , RTÃ jr and RTÃ Aertel Digital .
Simplified: RTÃ is one of the oldest television and radio broadcasters in the world .