A diplexer combines the dish signals and the antenna signals on a single coax and then breaks them apart again at the DSS receiver. These are available from several manufacturers and can be purchased from major electronics dealers and some home centers. One or both TVs can watch DSS, but they must watch the same DSS program. To watch local programming you will need rabbit ears on the remote TV, or a separate coax. Wireless systems are subject to interference from outside sources.
Wireless systems are subject to transmission difficulties.
A splitter divides the power of the RF signals in half. Either TV can watch any local programming without affecting the other. Not versatile Every time you split the coax, you are reducing the signal strength. These systems are 'pre-engineered' so you don't have to design them. In this figure any of 4 TVs can watch any of the local channels, or tune to channel 60 to watch the satellite program.