I "moved" so I could get Philly Pa Locals. But I'm right on the fringe of the spotbeam for the HD channels. All the SD is fine. My signal level on TP11 on the 61.5 is 15-20 sometimes a little lower. Is there a way I could put up a bigger dish for my 61.5 to increase signal strength, Like maybe a 24" dish or something like that?