Drilling out the rivets is a piece of cake. I have a C3 and love it. I
had to adjust the 10M driven element get the curve in the part of the band
I operate. I also may adjust the 15m ele. The 40m beam above it seems to
have moved the curve a tad. I tested mine at 40ft before installing it at
the top of the tower.
I would agree with everything Scott said about the Force 12 antennas. The
only negative is with the manual. Once you understand the concept it is a
snap. Keep in mind these antennas were assembled at the factory and then
taken apart boxed and shipped.
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