I’ve been looking around for PolyPhaser bulkhead mount lightning arrestors for HF (high power). I already have VHF and low-power versions. The part numbers for the versions that I could use are: IS-B50LU-C0 (UHF connectors) IS-B50LN-C0 (N connectors) Ron Smith K9QAM 23083 Maverick Ln Bend OR 97701 (541) 385-1156