The HWQ-80, HWQ-40 and HWQ-20 are all off centre fed dipoles. The HWQ-80 is designed to operate on 80m, 40m and 20m plus other bands with an ATU, the HWQ-40 on 40m, 20m, 10m plus 15m, 6m and WARC bands with an ATU and the HWQ-20 is designed to operate on all bands from 20m - 6m.
They have a feedpoint 1/3 of the way along, instead of halfway along, giving a feedpoint impedance of 200ohms. This is not ideal for modern day transceivers requiring an antenna with a 50ohm impedance. Therefore a M0CVO 1.5kW 4:1 BALUN is added at the feedpoint to alter the impedance to the 50 ohm required. This then allows the antenna to be fed using standard 50ohm coax such as RG8 or RG213.
The overall length of each antenna is:
HWQ-80 - 40.56m (133ft);
HWQ-40 - 20.28m (66ft);
HWQ-20 - 10.14m (33ft).
It may be mounted horizontally, as a sloper or as an inverted vee. If space is at a premium it may also be 'bent' to fit in with little or no loss in performance. Best performance will be seen when mounted at least one quarter wavelength above the ground at the lowest frequency. It may be mounted lower if necessary but, due to the varying nature of the ground below, the overall impedance and performance may be affected slightly.
due to the length of the antenna and the weight of the wire elements it is advisable to use the balun housing as a support for the antenna as well as the end insulators on the legs.
To reduce feedline losses it is advisable to use quality coaxial cable such as RG213. RG58 is thin and lightweight but is also very lossy.