Have came across the above subject item. Information that I have got from the Polyphaser.com web site has a unit that lists the same specs as this one, but is listed as IS-B50LN-C2-MA. This is a Broadband DC Blocked Protector 125-1000MHZ. Bulkhead Mounting; Protected side: N Female Surge Side: N Male Unit impedence: 50 ohm Anyone have an interest in this item? Thanks, Joe W7LPF