# Testing FA Antenna

**URL:** <https://discussions.flightaware.com/t/testing-fa-antenna/28731>\
**Category:** ADS-B Flight Tracking\
**Created:** [December 5, 2017, 1:34am UTC](https://discussions.flightaware.com/t/testing-fa-antenna/28731 "2017-12-05T01:34:21Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![abcd567](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/abcd567/32/113769_2.png) [@abcd567](https://discussions.flightaware.com/u/abcd567)\
**Post date:** [December 5, 2017, 6:47pm UTC](https://discussions.flightaware.com/t/testing-fa-antenna/28731/12 "2017-12-05T18:47:54Z")

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@deltaleader71

To determine what Interfering RF Signals are picked by your FA Antenna, use the method described in the thread _ **“Do I Need A Filter?”** _  
.

> [@Do I Need A Filter?](https://discussions.flightaware.com/t/do-i-need-a-filter/27833):
>
> The space around ADS-B antenna contain not only 1090 MHz signals, but also lot of other signals at different frequencies. The closer the frequency of a signal to 1090 MHz, your ADS-B antenna picks it stronger. For example if there are three signals of equal strength, one at 144 MHz, 2nd at 850 MHz and 3rd at 950 MHz, the ADS-B antenna will pick 950 MHz one the strongest, 850 MHz one a bit less stronger, and 144 MHz one much fainter. As the Cell/Mobile/Pager signals exist in the range 850 MHz to…

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_[View the full topic](https://discussions.flightaware.com/t/testing-fa-antenna/28731)._