The American and Canada Tv antennas and antenna systems are 2 Separate systems that Are Not connected together on to one coax.
2 Separate systems all the way to the location of the Tv where the 2 Separate coaxes will be connected to a remote control A/B antenna switch.
http://www.radioshack.com , #15-1968 , or ,
http://www.mcmelectronics.com , 32-4425.
Saveandreplay , also has the same A/B switch that MCM has.