I've done a bit more noodling with your location. First I reversed engineered the location using the TVFool data. Now, if you move south a bit so that the ridge is exactly between you and Mt Wilson the tvfool data looks like this:
http://www.tvfool.com/?option=com_wr...2c15a06c16e93c
Those signals should be strong enough.
Next I figured the angle from your house to up to Frankish Mountain (The one east of the golf course) as 9.66 degrees. Next I figured the optimum antenna height for a take-off angle of 10 degrees. For VHF, the height ranges from 6.5' on channel 13 to 8' on channel 7. The next peak would be 3 times that height. For UHF I used midband and it came out at 2.7' high. This assumes flat ground in front of the antenna. For up-sloping ground, raise the antenna, for down-sloping ground; lower the antenna.
The 2.7' high antenna suggests that the 91XG is the best choice for a UHF antenna. If a DB4e were placed that close to the ground the upper and lowest elements would be at dead spots and add nothing to the signal level.