Aeriel Installers near Chester

Can anybody recommend a decent installer around the Chester area?

I paid £100 for a new digital aerial and alignment, but the picture on the TV is poor on one of the frequencies (fine on others).

The lovely wife has forbidden the dreaded Sky option, so I need to get the best feed before I upgrade to a new TV.

Are the CAI a reputable bunch?

Thanks

Paul

UPDATE - I used Cross Border Communications, based in Chester and a member of the CAI. Pleased with the work.