I7SWX applies multi-band "Windom" of 3.5-28 MHz Fig.1. It has an input impedance of 300 Ohms and agreed with 75-Ohm coaxial cable with broadband transformer 4:1. The design of the transformer shown in Fig.2, 3. The antenna is used at a power of 200 watts VSWR less than 2.
Fig.1
Fig.2
Fig.3
Author: Gian MODA (I7SWX). Translation from English. A. Gaisin (UZ1ZWD); Publication: N. Bolshakov, rf.atnn.ru