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If you look on the back of the transmitter, you will find the “F” connector for the external antenna connector in close proximity to the switch which feeds the radio signal directly to the connector. The outdoor antenna connector REQUIRES the use of the “range extender/tuner” and RG-6 (73 ohm) coaxial feedline with matching series “F” connectors at each end.
There are two reasons for this. One, an external antenna cannot be used with just the cable and antenna and still maintain FCC certification (range extender required). And second, the transmitter requires the tuning circuitry of the “range extender/tuner” to properly match the transmitter output to the outside antenna, which screws into the top of the tuning box.
The TH transmitter output is not designed to match directly to the outside antenna by itself.