Broadcast AM Reject High Pass Filter (2.6 MHz HPF) by RTL-SDR BlogIncludes 1x RTL-SDR Blog Broadcast AM Reject Filter Designed to block the broadcast AM band between 500 kHz - 1.7 MHz with over 50 dB of attenuation. The 3 dB roll-off point is between 2.5 - 2.6 MHz. Works great with the direct sampling mode on our V3 dongles. This is a high pass filter and not a notch, so VLF will not work. Note, for RX use only.