Notch Filter (Bandstop): What is it? (Circuit & Design) | Electrical4U
Receive Filters
Amazon.com: Flamingo+ FM - Broadcast FM Bandstop Filter v2 (FM Notch Filter) for Software Defined Radio (RTL-SDR) Applications. Blocks Problematic 88-108MHz Frequencies from Your SMA-Connected Radio : Electronics
High pass 30 MHz and WFM broadcast notch filter 87-109 MHz
LNA for all: DIY "FM TRAP" or 88-108 MHz Band STOP filter