Simplify the following text for a Grade 11 native English-speaking person.
Original: There are a number of national and locally-produced television and radio channels available both over-the-air from the nearby RTCN BiaÅ ystok ( Krynice ) Mast , the seventh highest structure in Poland , in addition to transmitter sites within the city and on the cable television network within the city .
Simplified: There are a number of national and locally produced television and radio channels available both over-the-air from the nearby RTCN BiaÅ ystok ( Krynice ) Mast , the seventh highest structure in Poland , in addition to transmitter sites within the city . There is also a cable television system available within the city .