How To Combine Two TV Antennas for More Channels

Best way is to use the Televes 560483 Dual Input Antenna Preamp..I paid $69 few years ago for it and works great..Smartcom for 3 antennas and Avant X for 4 antennas..
 
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How To Connect an Antenna To Multiple TVs by Coax and WiFi

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Are Roku TVs Hiding Local Channels from an Antenna?