Hi all...I have a roofing filter for sale...comes with all parts...$135..also a Inrad 715c... 2.8 filter for the 455..check their web site..this filter really makes ssb sound great..$125..last filter is the 705c..this is the 500 hz ..455...I want $90... for it.....I can take paypal...please note I'm leaving on vacation 14 April..Thanks Bob