[Antennas] VHF J-Pole and Slim-Jim on UHF

[Deon Erwin ZS1ZL]

A 2m 1/4 wave antenna can be used as a 70cm 3/4 wave antenna.  The antenna
presents a low impedance on both bands and one only has to consider the
change in radiation pattern, making it an effective dual-band antenna.

There is a lot of local debate over the use of a 2m J-Pole or Slim-Jim on
the 70cm band.  In the 2m 1/4 wave example, the antenna is an odd multiple
of 1/4 waves on 70cm.  The J-Pole is a 1/2 wave on 2m, resulting in
something completely different on 70cm.

Some local hams claim that the 2m J-Pole or Slim-Jim also functions as a
dual-band antenna, just like the 1/4 wave example.  Surely this is 
incorrect?

Deon ZS1ZL