Paul Plack wrote: > Actually, in theory, a fiberglas-enclosed colinear array fed from one > end requires more elements and length to equal the gain of an > otherwise comparable colinear array fed at each element. The upper > elements of a Stationmaster are seeing less RF current than the ones > closer to the feedpoint, which degrades the pattern and gain. >
Well, the point was that a VHF 4-bay winds up being about 20', and yields about 6 dBd gain. A typical VHF Stationmaster-type colinear array, is about 23' long, and is spec'd at 5.2dBd gain or so. A 10dB gain Stationmaster-type antenna for VHF would be VERY long, and not mechanically stable, which I think you were getting at too. There are 9dB folded dipole arrays made for VHF, ie, and 8-bay. They are about 40' long, but because of that, they are only suitable for side mounting, they need a support at the bottom and in the middle.
