I respect ADTech's opinions.
If you are willing to take the risk that you could find only a few signals, I'd suggest a Winegard HD7698P. Retailers such as SolidSignal.com, Amazon.com come to mind... I would purchase from the retailer with the most liberal return policy.
Given your self assessment regarding your skill level and/or expertise, consider contacting a professional installer...
http://www.servicemagic.com/c.Audio-...MN.-12006.html
Before you commit to an installation, determine what they would charge to provide a 'site survey', which would show you what signals they can receive using their test antenna and receiver. I would avoid an installer that is not equipped to perform such a service.