[Tower Guy]

Your signals look strong enough to feed your TV and HD Homerun without a preamp. However, the strength of the TV signals should pose no problems to the new preamp. It is possible that strong local FM signals are causing preamp overload. Try your antennas with just a UVSJ combiner (don't use a backwards splitter) to see if reception of channel 35 improves. If you find that you need a preamp, try the inexpensive RCA PRAMP-1R, it has seperate inputs for VHF and UHF. Internal to that preamp are two independent amplifiers which help reduce overload.

In order to receive channel 9 from Sacramento you will need to reduce the strength of the northern channel 9 more than the front to back ratio of your existing VHF Yagi. The cheap approach is to mount the antenna lower on the south side of your house to attempt to use the house as a barrier to the northern signal. The more sure fire solution is to mount a pair of identical VHF yagis 7' apart and carefully aimed to minimize the signal from the northern channel 9. To learn about stacking antennas to reduce interference, read the ganging section of the HDTVprimer.