I suggest you go around the city first to make sure there is no local signal (weak signal or not in the room). If so, you can at least receive CCTV news channel. If you can't even see this channel, you don't have a CA TV encryption card (it is used to watch other encrypted TV channels).
CMMB is operated by China Broadcasting Satellite Mobile Broadcasting Co., Ltd., a subsidiary of the State Television Administration, and has its own operators in all provinces. Their toll-free number is 4006005577, and the official website is www.cbc.cn.
You can also post your questions directly to the 3GCMMB mobile TV network forum, and our professional netizens will answer them for you. For more information, I suggest you visit www.3gcmmb.com.