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Update:

 

I have my Marconi 5x up, with the GR45 from Signal Engineering at about 21' feet. Earlier I had a 102" whip in the top for over a month. During that time I compared it with my SD'r at 46.6' to the hub, and my Gain Master at 38.5' feet to the base, both mounted at the same height to the bottom of the antennas...where both were at 55' and 61' feet to the tips.

 

Today I was working some DX with these on my switch box and I could hardly tell any difference at times. Some times however, the GR45 was about 3 sunits less, but the noise was less...so I could hear better. Of these three my original AS Starduster, at 55' feet to the tip, generally shows the best signal by a little bit, and is also very quite and also hears really well when conditions are not too noisy.