“After several attempts to build a multiband C-Pole I finally ended up with the Multiband H-Pole. C-Poles for different frequencies on one pole must be fed with separate feedlines over separate current baluns.
In a first attempt I fed the H-pole in the center with a ladder line. It was electrically no longer an “off-center-fed-dipole” as the C-Pole was, but a vertical, folded “doublet”.
The C-Pole is a resonant antenna, whereas the H-Pole is non resonant and must be matched with a tuner.
Construction and materials used for the H-Pole are similar to the C-Pole. I use non conductive glass fibre fishing rods, beware of conductive carbon fibre!
The first results are very promising. I had contacts with excellent signal reports within a few minutes on all bands except 80m at @ 12:00 UTC in July 2008.
I used the SG-239 Automatic Tuner (asymmetric !). So far, the sound of the automatic tuner, was “healthy”, only a few “clicks” and down was the SWR! I connected the lower half of the H-Pole to the ground connector, the upper half to the “hot” side of the tuner output.”
Elevation Diagrams H-Pole [black] Versus C-Pole [blue], 0.5m over MININEC-Ground, 20m-Band
The Azimut Diagrams for both antennas are omnidirectional
See EZNEC-File: multi-h-pole-tl.ez
IC-9700 Icom Inc. has released more details about the launch of the IC-9700 VHF/UHF/23CM All-Mode SDR Transceiver. Icom plans to release this high-per... Read more
Designed for Weak Signal, Tropo Scatter, Meteor Scatter, Digital, & Contest Operation! The BEKO HLV-1250 is a special 25th Anniversary Amplifier c... Read more
The Alpha 9500 is no ordinary linear amplifier. The Alpha 9500 is the culmination of over 40 years of design and engineering. The Alpha 9500 is an adv... Read more
Messi & Paoloni – Notwithstanding its small dimension (7,3 mm) its performances are so good to outperform RG 213/U (10,2 mm) and put into sh... Read more