Originally Posted by tvmaster
any examples or links of what a lot more metal may be, and when you say preamp, I'd also need to get AC up there as well?
Your best shot to LA are the VHF stations (7, 9, 11, 13 at the moment) and there will be more after the repack. So, you will want a VHF antenna at least for VHF-Hi unless KVCR moves to Mt. Wilson on Lo-VHF. We will know in about a month if there will be more Lo-VHF's here as well.
First I want to ask if your 2 Silver Sensors are on the same cable run? If so, get a switch or rotator (commonly just called a rotor). Two antennas pointing in different directions can result in unexpected patterns and make things worse.
Try a new antenna before a pre-amp, but you are probably going to need one. What coax cable are you using? Make sure it's RG-6. A pre-amp doesn't need an AC outlet on the roof. The power is fed thru the coax.
Knowing that VHF will play a larger role, I would suggest something pretty hefty. Something like this, perhaps:
If you don't care about Lo-VHF/FM:
If you do want Lo-VHF/FM:
This thing is huge (14' long and 9' wide) and it's probably best to wait for the new channel allocations to come out to bother with this, unless you want FM too. My Uncle lives in San Clemente and even LA FM radio is tough there.