# Filter needed? **URL:** \ **Category:** ADS-B Flight Tracking\ **Created:** [January 17, 2025, 12:28pm UTC](https://discussions.flightaware.com/t/filter-needed/96797 "2025-01-17T12:28:36Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![kmm0000](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/kmm0000/32/135589_2.png) [@kmm0000](https://discussions.flightaware.com/u/kmm0000)\ **Post date:** [January 18, 2025, 12:29am UTC](https://discussions.flightaware.com/t/filter-needed/96797/3 "2025-01-18T00:29:21Z")
Check this thread. > [@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… --- _[View the full topic](https://discussions.flightaware.com/t/filter-needed/96797)._