Greeting to the group:
I don't recall who asked the question originally, but I think the
answers, for the most part, all agree that one high and one low
antenna will provide about the best performance mix.
I have seen a couple of manufacturer references, but no one has
mentioned C3i (if someone did I missed it).
The present K8GP operation uses six C3i C5-50 antennas, a 2 x 5 and a
4 x 5 stacked vertically (http://www.k8gp.net). But before we built
the 2- and 4-Yagi arrays we used a C3i C7-50 as the primary 6-meter
antenna. Both of these antennas were designed by Clarke Greene, K1JX,
who long time VHFers will recall was one of the operators at the W1VD
multiop.
If I were going for a "big" antenna, the C7-50 would be my first
choice. It is more durable than the M2 equivalent (just ask the guys
who lived in the Northeast how their M2 antennas held up a few years
ago in the ice storms), is a contest-proven performer and is very easy
to assemble and get on the air.
The C3i C5-50 is of the same quality construction and performs quite
good for its size (I use one from home).
Hope this is helpful ...
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Chuck Watts, W4XP; FM18ew -- 1.8 MHz through 10 GHz
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