Antenna(s) + pre-amp advice required for 95127

[aguitaris]

Greetings,

I kindly request for antenna(s) & Pre-amp advice based one the following information:

Zip code: 95127
2 storied single family home.
Number of TV's : 2. I currently have a dish network dish antenna that does the wire splitting to the 2 TVs
Terrain- mostly 2 stroried houses with some trees around the area. but not heavily forested. (I'm by the Alum Rock park foothills)
TV: Sony NSX-46GT1 @ 1080p & my second TV is a samsung digital TV @ 1080p (both with built in TV Tuner)

Also, as requested here's my TV Fool link
http://www.tvfool.com/?option=com_wrapp ... 08554fa81f

I can roof mount my antenna, about 15/20 ft high. From the looks of it most of my stations are UHF, some VHF. I figured I might need 2 antenna', but I'll defer for your professional suggestion.

Thanks a lot (in advance) for your help with this setup.
Regards