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Query: Slim Jim Antenna
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Details the construction of a J-vertical antenna specifically for the 10-meter band, offering a practical alternative to a _Slim Jim_ design for 28 MHz. The resource outlines the use of aluminum tubing for the half-wave vertical section and coaxial cable for the quarter-wave matching section, providing specific calculations for element lengths based on frequency and coaxial cable velocity factor. It contrasts the performance of the J-vertical with center-fed dipoles and end-fed verticals, noting superior results in previous comparisons. The article further presents a more recent iteration of the J-vertical, constructed using a fiberglass pole and insulated wire, with updated dimensions for 28.8 MHz. It includes practical advice on weatherproofing connections and securing the antenna for durability against adverse conditions, referencing the survival of an original _J Vertical_ during 110 MPH winds in 1987. The SWR performance is reported as 1.1:1 at 28.6 MHz, maintaining below 1.5:1 across 28.3 to 29 MHz. -
2 meters copper tube antenna, tested with an Icom IC-V8000 -
How to make a simple but effective Slim Jim antenna. It includes a calculator to work out all the mesurements for the frequency you require. -
How to make a Weatherproof Vertically Polarised Omnidirectional Aerial, The Slim Jim Antenna -
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This VHF 145 MHz antenna is easy to build and with no radials. It shows equal gain of 5/8 lambda. It is light weight, you can hang it somewhere (on a tree may be) and work. -
G0KYA's Amateur Radio Blog, make a 2m Slim Jim antenna out of 300 Ohm ribbon cable. -
A 10 meters band Slim Jim antenna project, made with a 450 Ohm slotted ribbon cable and secured on a 8 m fishing pole, by Steve G0KYA -
This 4m Slim Jim Antenna is cheap and easy to build yet it greatly out performs the more usual dipole due to its low angle of radiation. An SWR of 1:1 is obtainable across the 4m ham radio FM band with a simple adjustment. -
A vertical monoband antenna design that can work from 6 meters to 70 cm by F5ZV in French -
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2 Meter Indoor Slim Jim Antennas for Cyclone Season and Other Uses by VK4MDX -
A Unique VHF Antenna with gain over a J-Pole Jose I. Calderon, DU1ANV -
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K0GKJ project of a copper tube slim jim antenna for two meter band -
A 144 Mhz Slim Jim Antenna, aluminum tubing version project by Mohammad 9W2WTF -
Build the Slim JIM Antenna, a unique VHF Antenna with gain over a J-Pole Jose I. Calderon, DU1ANV -
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A comparative article on performance differences between Slim Jim antennas versus J-Pole antennas -
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Slim Jim Antennas are great for apartments and hotels. VHF UHF Antennas -
Easy to use online Slim Jim antenna calculator. Input your frequency to automatically calculate the lengths of the different antenna parts. -
A simple slim jim antenna for 433 MHz. Simple drawings and pictures of a simple Slim Jim antenna. -
A comparison among a traditional J-Pole Antenna and 2BCX Slim Jim Antenna -
The Slim Jim VHF antenna, originally designed by G2BCX, is a folded half-wave dipole fed by a quarter-wave matching section. This version, built from a recycled professional aluminum dipole, demonstrates that various materials—such as copper, brass, or twin-lead—can be used. The article details the antenna’s construction, required materials, and tuning process, emphasizing mechanical stability and ease of assembly. With proper adjustment of the feed point, it provides excellent SWR across the band. Its durability and simplicity make it a practical and efficient VHF antenna solution. -
The 4m Slim Jim antenna project provides a construction guide for a low-cost, high-performance aerial designed specifically for the 70 MHz FM band. This design achieves a 1:1 SWR across the 4m FM band with straightforward adjustment of the feed point, utilizing RG-58 coax. Its low angle of radiation contributes to effective signal propagation. Construction involves using plastic knitting needles as spreaders and a telescopic fishing pole for support, with components secured using two-part epoxy. Annealed bare single-core copper wire forms the radiating element. The setup process includes raising the antenna at least 3 meters above ground for tuning, adjusting the RG-58 feed point for optimal SWR, and then soldering connections. Waterproofing is achieved with yacht varnish. The design emphasizes low wind resistance for durability, making it suitable for exposed outdoor installations. A PDF construction diagram is available to supplement the written instructions.