Hi - I'm not connected with the industry, but if I were you I would be thinking big antenna on as high a mast as I could manage. Maybe the HD1850?
http://www.antennacraft.net/Antennas...llChannel.html You have a whole lot of stations from the LA market at 70 magnetic, but they seem to range from weak to impossible, at least at that antenna height. Looks like you have a few near-in hills that block the signal from Mt. Wilson (check the KABC profile - click on the call sign). Going higher may help you a lot.