The Innovative solution for those who want gain and directivity without a tower!
Making a gain antenna that doesn't require a tower usually falls into the area of switched vertical arrays, like a 4-square. Some of the problems are the radial field and the phasing/switching system. We started with 20 meters.
The most straightforward approach was to put together a 2-element vertical array. The Bravo series would be excellent, except for the horizontal resonators make it awkward and potentially a safety issue. The key was to eliminate the horizontal components in the elements. After a year's work, the result is the new Evolution Vertical™. In an attempt to describe it in a few words (like in patent), it is a radical-ratio asymmetric vertical dipole. The feed point is also right where you want it - at boom level.
The first rotatable vertical beam was a 20-meter 2-element. After using 2-element arrays for years on beaches with Team Vertical, it felt powerful to have one that could rotate. This was really breaking new ground and when it was rotated for the first time, it was amazing. This 2-element 20 meter is called the EVA-220, for Evolution Vertical™ Array.
New Evolution Verticals
EV-5K $249 Bands-20-17-15-12-10 meters. Internal balun SO-239 coax connector. One jumper band change ~14' tall and 9#, 1kw cw
EV-5R $359 Remote Control model of the EV-5K.
EVA-220 $489 2 element 20 meter rotatable vertical beam. Single lobe, 4.1-4.4dBi at 19° over 125kHz bandwidth. RBN-verified 8-13dB F/B over ground 120° ½ power beam-width. Vertical above boom is 17' ((1/4 λ) 21' overall height, 9' boom, 20#. Tuned for CW, >250kHz 2:1 VSWR >1kw, use RF choke, or 1:1 balun.
EVA-52K and EVA-52R 5-band, 2 element rotatable vertical beams. EVA-52K, manual band change $629. EVA-52R is remote-controlled, 6-conductor control line $789. Both of these antennas cover 20, 17, 15, 12, and 10 meters. They have a 9' boom, internal balun, SO-239 coax connector. 500 watts (reduce for RTTY). Similar performance to EVA-220 verified using the RBN.
EV-43R $499 40-30 meters relay control ~19.5' tall radiator >24' overall. Straight base or tri-pod 17#, 1kw cw. The antenna is also available in 2-element rotatable.
EV-42R $499 40-20 meters relay control ~19.5' tall radiator >24' overall. Straight base or tri-pod 17#, 1kw cw. The antenna is also available in 2-element rotatable.
EV-432 $389 40-30-20 meters. ~17' tall radiator 22' overall 3-section tri-pod legs or straight base post. Quick band change 13#, 1kw cw.
EV-432 $389 also available in 2-element rotatable.
Copyright 2017 T.H. Schiller, N6BT - All Rights Reserved.