144MHz Big Wheel Antenna

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The "big wheel" is a horizontally polarized omnidirectional antenna . Normally, high gain directional antennas are to be used for VHF or UHF communication, in order to multiply the radiated energy into the desired direction or get rid of interferences from other than the desired direction. However, the directional characteristics of a beam antenna is not always an advantage or wanted. For general coverage purposes, an omni pattern is desirable allowing the operator to scan in all directions for signals of interest. Normally the beam stays directed into the general direction of most radio activities and some possible contacts may not be heard. That's when the Big Wheel comes to play: It's an ideal antenna to be used on top of the high gain yagi as well as a great omnidirectional antenna for contesting. These antennas are made of anti-corrosion aluminum material and all nuts and bolts are made of stainless steel. The gain is approx. 3dBd and the antennas utilize an N-connector. It's possible to stack two Big Wheels horizontally and thus increase the gain to approx. 5 dBD onmidirectionally! For correct coupling and tuning of both antennas, it is recommended to use a phasing line


Electrical :
Frequency : 144-146 Mhz
Gain : ca. 3dBd
S.W.R. : 1.2 - 1.5
Max. power : 500 Watts
Impedance : 50 Ohm

Mechanical :
Diameter : ca. 1.2 m
Mast dia. max : 65 mm
Weight : 0.7 kg
Stacking distance : 1300 mm
Connector : N jack


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Damien F5RRS Webmaster
Last update of this page: February 2001