Blocks the broadcast FM band between 88 - 108 MHz with over 50dB of attenuation. Designed for RX use only. Designed for maximum attenuation between 88 - 108 MHz and the 3dB roll off points are at 76 MHz and 122 MHz. Insertion loss is less than 0.5 dB between 0 - 1 GHz, and mostly less than 1.5 dB between 1 - 3 GHz. Designed for SDR and radio scanner users. TV installers this is probably not the right product for you. TV installers please read the description carefully to avoid disappointment.<br><br>Note: RX filter only. Designed for SDR users, but might also be useful for TV users struggling with FM interference. But TV users please carefully check the spect analyzer graphs and 3dB roll off points to ensure that it will not block a TV signal of interest. e.g. Channels between 76 - 88 MHz could be attenuated enough to lose reception. Colour:As Shown Material:aluminum<br><br>Package Contents: 1 * FM band stop filter<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.