Common Mode Noise Filter – Coax SWAN Electronics Transceiver RFI Kits Store/RFI Solution Kits/Radio Communication RFI Solutions/HF/VHF Transceiver RFI/Noise Kits/SWAN Electronics Transceiver RFI KitsRefine by FiltersClear allFiltersClear allShow itemsShow itemsSWAN 250, 350, 400, 500, 700 Transceiver RFI Kit - 4 RFI/Noise Reduction FiltersSWAN 250, 350, 400, 500, 700 Transceiver RFI Kit - 4 RFI/Noise Reduction FiltersSKU RFI-SWAN$34.95 Buy Now Typical user comment: The filter was quite effective. Was surprised that it actually reduced the noise level more than the signal so S+N/N improved by 1.9 S units. Bill