I've been using the Diamond SG-7900NMO for a while now and have NEVER had a dual bander come close to this antenna. It's big, it's heavy and if not mounted right I could see where problems could arise. I've tried the Larsen and yes it is cheaper but in a side by side I don't think there is any comparision IMHO. My 2 cents and your results may vary (but I don't think they will

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73!
Mark / W2KRP
SMIRK #6524 - 6MWW #2159 - AMSAT #35620
http://www.w2krp.com(Remember to sign my guestbook!)