the older 201's are better IMO. I have been using them for over 20 yrs.since PD changed hands yrs ago the new stuff is not the same. of the last 6 RFS 201 we bought 4 went back inside of a yr b/c the radome separated from the support pipe. I still have on in my service bay just because. here is what I have been using for a while, cheap light and work OK 5dbd http://www.tessco.com/products/headerProductSearch.do?searchType=1&searchField=1&searchText=fg4605 also in 7dbd http://www.tessco.com/products/headerProductSearch.do?searchType=1&searchField=1&searchText=fg4607 these are list prices if you hunt around you can find them for almost half that. here is the current 201 http://www.tessco.com/products/displayProductInfo.do?sku=341716&eventPage=5 I am not to familiar w/the comet or diamond antennas ,you'll have to search here to see what thought are on those.