Shakespeare, then Pacific, then GME. Also go 6dB if possible and yes RTM are one of the few general chandleries that carry that brand. I replace mine with a 2.4m as it was mounted on the side of the cabin but I would pobasbly go a smaller whip if targa mounted, something to do with rock n roll and the signal, Scottar could probably give us an education on it (actually I think he did when I had a problem but I've forgotten the details as it now works with a new aerial).