I'm located about four miles northeast of Pinnacle Hill (or put another way, I'm diagonally across Ellison Park from Legends).
OK, silly thought here...can you turn off the amplifier on that Radio Shack antenna? Or have you tried the box with the other antenna that's hooked to the TV?
I ask because at four miles away, I presume you should be able to get full powered DT stations in your teeth, and the amplification may be disrupting the signal with too much noise.
Perhaps Cobbs Hill is in the way, but I don't think so. I don't know of any other terrain issues. What is weirdest is that if a car passes the house behind where we live, the signal pixellates. That shouldn't be in the path between the tower and the house!
OK, maybe you're getting some reflected signal somehow. When our PBS affiliate out of Cleveland lit up a slightly-more-powerful temporary signal, my box finally started seeing SOMETHING on DT 26, but only if I pointed the antenna AWAY from the logical place that gets all the other DTs out my loft window.
Others locally will have to help you with the terrain issues (ditto Aaron down in Canandaigua and Geneva), if any, but bottom line...if you CAN go outdoors, it's pretty much the only thing that's likely to clear up all of your OTA issues.
I can understand if you don't wish to do so, though.