Yes you can just T them but you may loose some signal in the T connector.
The losses will be minimal if at all. A duplexer is for connecting 2
transmitters to 1 antenna but serves no purpose for receivers.

"Chris" wrote in message
...
Hello to the group. I have just purchased a Uniden 796D for home use and
need your valuable input. I've just purchased an Antenex 3db 800 meg
omni-directional base antenna, that I plan on installing on my roof, for
optimum reception (and Belden 9913 cable as well). I already have a
VHF/UHF
base antenna up on the roof and I would like to run both antennas to the
796D. Can I get by with just using a T-connector for both antennas or do I
need to go with some kind of duplexer? If any of you have done something
like this, I would like to hear your ideas.

Thank You,

Chris