Simple HF Antenna With Gain

摘要

Now that the new sun-spot cycle is beginning to show improvements on the HF bands, activity is increasing. One disadvantage that many new operators have is that they are limited to just a simple dipole antenna and in particular with Novices low power. Described below is a simple wire antenna which has a gain of about 3dB over a dipole, but has the advantage over a beam in that it is simple to construct and more particularly is as unobtrusive as a dipole. No originality is claimed for the antenna, which is based on the 'Zeppelin' antenna used on German airships up to the late 1930s. This version is a stretched or Extended Double Zeppelin, which consists of two collinear elements fed in phase to give gain. The arrangement is shown in Fig 1.