This surge arrestor connects to the VT-4 HF Whip Antenna and was designed to protect the antennas electrical system from lightning and other high-voltage surges. The effectiveness of this device depends on reducing the transient system overvoltages to levels compatible with the terminal-apparatus insulation keeping the antenna system protected.
Build or Buy a Short Dipole? • Designing a Shortened Antenna CT1EOJ QST Oct 2003 • Model it in NEC – Tweak the design for multiband coverage • Buy from Barry, KU3X, Hypower Antenna Company (QST, Internet) 2B8040L – He’s already done the design work
The take-off angle will not be any lower and the longer antenna brings along more lobs in the antenna pattern which are divided many times so they tend to be weaker. Above we see the pattern produced by a 5/8 wave antenna with a length just under 7 meters.
The Laird / Antenex QWFT120 is an 24 inch long, chrome, ¼ wave whip antenna with NMO base. This antenna requires a metal ground plane, is omnidirectional, offers Unity/2.15 dBi gain and accepts up to 200 watts max power and operates in the 118-512 MHz MHz range. Laird Technology’s family of Quarter Wave Whip antennas all built with stainless steel materials and feature gold plated contacts for corrosion resistance and best power transfer.
How-To: Build a WiFi biquad dish antenna Wireless enthusiasts have been repurposing satellite dishes for a couple years now. This summer the longest link ever was established over 125 miles using old 12 foot and 10 foot satellite dishes.
I made two 7ft whips for about $130. I bought a separate controller as I used 4 rolls of leds to cover the all of the 7ft whips. I used a relay switch in wiring mine up. If you make 3ft or 4ft whips you can probably get away with an in line fuse. I used 4pin waterproof connectors at the whip connection.
Whip Antennas for a sandrail, rock Crawler, KOH, Ultra4, truck, UTV, side-by-side, dune buggy, mini buggy, manx, king of the hammers, 4x4 or Jeep
DIY Miracle Whip Antenna. I always liked the Miracle Whip / Wonder Wand type of QRP antenna’s but could never stomach the price. So, I just built my own to use with my FT-817. The antenna is a 6′ telescopic antenna from an old CB and the case is the cover/protector for my car stereo removable faceplate. The inductor and position switch were just a used toroid and a used 12 position switch I had around.