Here we go again: Sure it works well, but that's not likely to last forever. For now, all of LA's DTV broadcasts are in the UHF band. On Feb. 18, DTV channels 7, 9, 11 and 13 migrate back to their VHF-high assignments. Capable as it might be for UHF, the C4 is not a VHF-high antenna, despite vague advertising claims to the contrary. You said it yourself: "Got to admit that the old analog stations don't come in very good." Those four channels are probably among the analog stations, aren't they? If so, that's a hint that you're very likely to be looking for a VHF-high-capable rig in late February.
My antenna-selection advice was based on the OP's stated desire to pull in a channel 7 station from 90 miles out. The C4 ain't gonna do that. I won't bad-mouth its performance -- lots of people have reported having good luck with them -- but I will take issue with its cost. For about the same price, one can buy a 91-XG. It's made by the same company and it absolutely smokes the C4.