cvoptimus

Thanks Mr. Know it All, but I already have a UHF antenna. My antenna is designed for both UHF/VHF. Remember, I was receiving all the local digital channels with few problems until Saturday. So, what's the variable? My equipment hasn't changed, so it must be the way the channels are broadcast. So bicker's explanation seems to make sense.
And thank you HTNut, your map confirms what I have found on other sites. I should be receiving a strong, easy to capture signal from all the local channels and more (Even with the missing stations I get 45-50 OTA channels). The government site (DTV.gov) has a helpful map that will even show the direction the signals are transmitted from to my address. All the local stations in my area come from the same direction.
That lends even more weight to bicker's hypothesis. If all the local channels are transmitting from the same direction and only two channels vanished after the transition, two channels owned and operated by the same affiliate, it must have something to do with the strength of their signals.
I can only hope that the problem is widespread enough that the local affiliate will feel obligated to do something about it.
How about it readers? Anyone else in L.A. who's lost KTTV and KCOP after the transition?