I recently bought this fiter. It works extremely well. The 75 foot long wire antenna picks up lots of signals and was over loading the SDR-RTL front end with mosltly AM band interference. With the filter, its like having a whole new radio. Short wave listening is clean and it appears the noise floor is also lower.
After the move 3 years ago, finally getting HF and shortwave back. Found everything but my par FM filter. Found the NOAA one, but this wekend went digging and found the Par FM trap. My MLA30 loop is hearing fine down to DC.
Cspaned, I have a sodium light now, but have a manual loop mover, me. For optimum receive I need to point to the light. My noise floor jumps a ton. Maybe have the power company turn it off and line the driveway with solar LEDS.