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been meaning to put this out there for a while,since I have had a few conversations about this w/various members. first pics,cables from L-R w/associated N male connectors. RG8/213 LMR400 type, 1/2Inch superflex, 1/2inch hard line also known as Heliax, 7/8inch hard line. [ MyGMRS STAFF EDIT: 3 Photos no longer available from linked source.] now lets talk about the losses in Db and how much power that is. Cable type loss at 100Mc 400Mc RG8/213 2.0dB/100' 4.7dB/100' LMR400 1.2 2.5 Hardline type 150Mc 450Mc 1/2" superflex 1.3dB/100' 2.3dB/100' LMR600 1.0 1.7 1/2" Heliax 0.85 1.5 7/8" Heliax 0.44 0.8 1-1/4" Heliax 0.3 0.6 dB loss power loss in % 0.5 10 100W in 90W out 1.0 20 1.5 30 2.0 37 2.5 44 3.0 50 3.5 56 4.0 60 all of the above loss specs are manufacture specs, I strongly suggest that you measure your line loss w/watt meter if possible to know exactly what you are getting at the antenna. IME most of the book specs are on the money for hard line ,RG8/213 can be a crap shoot depending on manufacturer. I've had some really bad and some pretty good. LMR I've had a love/hate relationship w/, good cable but seems to be prone to moisture issues. wish I had pic of the 7yr old cable that pretty much self destructed. hope this is of some help to those looking to put up a machine or control station in the future. JE ***EDIT*** found this very useful http://www.arrg.us/pages/Loss-Calc.htm