If you meant 'OTA' and had antenna questions, check the link below. Lots of information.

http://www.hdtvprimer.com/ANTENNAS/basics.html

I'm using an indoor antenna (Zenith)for OTA HD programming and works fine for now. I do not have to move it too much to pick up broadcasts, but I do live in an area with a few obstructions. I may upgrade to a 4 bay outdoor antenna.

Good luck.