Use of the word 'air'

Question

In the following three which one is incorrect?

1. TV channel is relayed.
2. TV channel is aired.
3. TV channel is telecast.

Is a channel 'relayed'or its programs are relayed?

Answer 1

First you need an article:

A/The TV channel is xxx.

Regarding your word choice, dictionary definitions should be helpful.

Regarding the electric signal traveling through the air to your TV, use broadcast. relayed refers to the signal between transmitters.

aired and telecast refers to TV programs.