Code:
OTA --\ /---OTA box
SAT--mswitch--<tuner 1 cable>--diplexer---Tuner 1
OTA --\ /---OTA box
SAT--mswitch--<tuner 1 cable>--diplexer---Tuner 1
If it has an ATSC tuner, there are all kinds of things it can do with OTA. OTA is not just for HD.