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Hello. I use a RUTX09 which for now is connected to two omnidirectional antennas. I am in the mountains and depending on the transmitter that works, I pick up a transmitter at 150 meters or a transmitter at 15 km. Do you think I could put an omnidirectional antenna on the "MAIN" input and a directional antenna that points to the most distant transmitter on the "AUX" input? Thanks for your advices.

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Generally the Aux antenna is used for noise cancellation when both are in use, so i would suggest using the directional antenna as the main and the omnidirectional antenna as the Aux. Also i would suggest switching it to your above given suggestion to check the performance to make a comparison.

Hope this helps !