Tom_M wrote: This thread is almost 10 years old. I do not have access to a spectrum analyzer but my tests were vastly different from SCVJeff's. For me the Jack was on par with the Batwing for the UHF band but did poorly on VHF.
SCVJeff has not been active on this forum for several years.
I found much the same thing, plus, I can use my Jack while rolling down the road at 65 mph and never have to remember to put it up & back down.