What does the phrase more of it mean in the following sentence?

Viewers want better television, and more of it.
and more of it: and more television

It usually means television programs of a better quality.

Teachers: We supply a list of EFL job vacancies
What does television stand for in that sentence? Does it stand for TV channels?
 Clive's reply was promoted to an answer.
Students: We have free audio pronunciation exercises.
Thank you, Clive.