Steven Fritts wrote:
I wonder if anyone has tried the MFJ collinear dipole that they have
in their new catalog. It is two half waves with a quarter wave length
of 450 ohm ladder line shorted at the bottom hanging down with an
SO 239 connector for the 50 ohn feedline connection.

Sounds like a Double Zepp with a J-Pole-like matching stub.
The antenna feedpoint impedance is very high. The 1/4WL ladder-
line stub is shorted at the bottom. At some point up from the
bottom, a 50 ohm point can be achieved, just like on a J-Pole.
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73, Cecil http://www.qsl.net/w5dxp