40m dipole antenna
Dipole antennas for the 7 MHz band
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The page provides a project for an indoor wire antenna for the 7 MHz band, based on a design by F6CYV. It aims to help amateur radio operators lacking space to set up an antenna for 40 meters. The author shares their experience using the antenna inside an apartment, noting good reception of European signals and contacts with over 150 countries. The project details the materials and dimensions needed for the antenna, along with tips for optimal performance. -
The N2CKH travel special 300 Ohm ladder line convertable antenna -
The K4VX linear-loaded dipole for 7 MHz, simple and practical way to make a short but efficient 40-meter dipole. -
An excellent all-around 40 meter antenna for those who don't have room for a multi element yagi antenna -
Interesting little project with a couple of loading coils by M0MCX -
A 40 80 dipole antenna design by WA6ESC PDF File -
An easy to make trap dipole antenna for 40 and 20 meters -
A coil loaded dipole antenna for 40 and 80 meters band by I2CN -
GM4JMU shortened dipole for 40 meters band. This article illustrates in detail how to build a resonant antenna for 7.030 MHz. Cut two 10.25-meter pieces of insulated wire, wind 40 turns of wire onto plastic tubing, and connect the wire to a central insulator using a choke balun built of RG174AU coax and a ferrite toroid. Once built, the antenna is adjusted by altering the wire length to produce the lowest Standing Wave Ratio (SWR) for best performance. The guide emphasizes careful building and adjustment for the best results. -
This article documents an unobtrusive antenna for operation on 7MHz, primarily for contacts with stations at up to 1000Km range. -
This article describes the design of an antenna for local contacts on 7MHz, including a simple and efficient matching system that presents a 50 ohm load to the transceiver. -
An Attic Coaxial-Cable trap dipole for 10, 15, 20, 30, 40, and 80 meters -
Want to operate on 40 meters but only have a space a little over 16X16 ? Try this antenna. -
Shortened dipole with traps for 40 meters band in portuguese -
Here is a very simple and practical way to make a short but efficient 40-meter dipole. The K4VX Linear-Loaded Dipole for 7 MHz -
A simple dipole built for two-band operation can be used for portable use and operate 20 and 40 meter bands -
The page provides a project for an helical dipole for the 40 meters band, resonating on 7 MHz, created by PY1ZFK based on a design by DL8VO. It includes detailed instructions on building the antenna. -
A simple dipole for 40m band feeded with 450-Ohm openwire feedline includes MMANA Gal files to download -
A short but efficient dipole for 40 meters band -
Build yourself a postage stamp 40 meter wire dipole antenna that fits in a space a little over 20 wide and works reasonably well at low heights -
Drawings pictures and notes on a rotary dipole antenna for 30 and 40 meters band -
The Linear-Loaded "Crappie" 40M Rotatable Dipole A Short 40 Antenna You Can Build for $50 or Less by VA7ST VE7ASK -
The GM4JMU Shortened 7Mhz Dipole -
Drawings of shortened antenna for indoor usage, using short pvc tubes for 2 , 20 and 40 MHz by f1rfm -
A shorten Dual-Band Dipole with overall length of about 11 m. For this antenna traps are substituted by inductors, in order to cover the 10 & 40 m. Bands. -
Short dipole antenna for 40 meter ham band. Can be put up in the space required for a 20 meter dipole. -
I0SJC trapped dipole for 40 and 80 meters, traps done with 170 turns 1 mm diam, on a 3.2 mm cilinder in Italian. -
Build a space efficient trapped dipole antenna for 40-80-160 meter bands using RG-58 and PVC pipe. The document provides a brief guide on building a compact dipole antenna appropriate for the 40, 80, and 160-meter amateur radio bands. It explains the materials, building processes, and tuning methods required to provide best performance while preserving space. The paper also discusses theoretical elements of dipole antennas, such as impedance matching and feedline selection. -
This article explores a theoretical model for the losses of an 80m / 40m trapped inverted V dipole antenna system using a bootstrap coax trap, but does not examine the pattern of the antenna. -
A multiband 80-40-20-15 meters dipole wire antenna that can be extended to cover 160 meters too. -
A shortened dipole for 40 meters band by Martin E. Meserve -
Inverted Vee antenna for 40m with simulation data by DF9CY -
This is an short dipole for 7 MHz. Total length of this dipole is just 10 meters, 33 feet. Missing lenght is balanced by a coil made of 49 turns of a 40mm diameter pvc pipe. The use of a choke balun is recommended, as always, to adapt the unbalanced coax cable to the balanced antenna, and to prevent RF feed back along the coax shield. -
The antenna consists of 6 runs of stranded wires spaced by plastic Hula Hoop spacers made of poly tubing -
Full article on how to build a home-made wire dipole antenna for 40 and 80 meters band. Article is fully in italian, as it was published on ARI RadioRivista, but is plenty of self explaining pictures that will guide you on homebrewing this trapped dipole antenna for the lower amateur radio bands. -
A short dipole wire antenna for 40 meters band. It is a folded dipole that do not make use of coils and can be used either in horizontal or inverted V configuration -
The antenna build into this project is made from 2 fishing poles on a fiberglass pole in the center. -
An inverted V antenna for 40-80 with loading coils. This antenna is a full size on 40 and a shortened 80 by KG0ZZ. -
The Dipole Bazooka Antenna for 40 meters is a popular choice among amateur radio operators. Its design allows for easy construction using materials like RG58 coaxial cable and PVC. Measurements are calculated using specific formulas; for instance, at a frequency of 7,100 MHz, the total length is approximately 19.74 meters. This antenna offers a performance range of 97% to 99%, with an impedance of 49 to 52 ohms. Additionally, it can handle up to 1 kW of power and requires no modifications for connection. -
Complete collection of the four main parts of this excellet research on modelling and designing half wave dipole antennas for 40 meters band, covering all aspects beginning from full wave length antennas, to shortened, loaded and reshaped dipoles -
How to home made a custom home made dipole antenna for the 40 meters band, just 66 feet long. Enjoy the band openings during the evening and play morse code or digital modes on this magic band. -
Dipole for 40m band. It is a simple linear loaded dipole feeded with 450-Ohm openwire feedline. Designed it for resonance at 7.050 MHz, can be tuned on 30m and 80m bands with an external antenna tuner. Build with simple electrical copper wire (2.5 mmq/13 awg) and two fishing poles with size of about 7 m/23 ft. -
This article demonstrate how to build and mount a 40 meter loaded dipole using basic materials. This antenna reduce the overall length of an HF dipole through the use of loading coils. -
A simple portable dipole antenna for the 40 meter band using a total lenght of 18 meter. It can be used for 80 to 10 meters coverage using a antenna tuner. -
A rotatable 40-meter dipole antenna designed and constructed to fit within backyard constraints. The project utilized two fishing poles attached to a fiberglass center pole, resulting in an easy-to-build, lightweight, and cost-effective antenna. Essential materials included fishing rods, a center support pole, mast support, and basic tools. Linear loading was implemented to achieve the necessary length for optimal performance. The antenna, which proved effective during the contest, is ideal for field days and additional contest bands. Assembly and installation were straightforward, showcasing the antenna's practicality and efficiency. -
A shortened 7 MHz Dipole antenna as described by Ken GM4JMU in Sprat 74. -
A simple TRAP-dipole project for 20 and 40m bands includes EZNec simulations -
This 40 meter Inverted V antenna was tested and tuned at a height of 35 feet and proved excellent results. The ends of the antenna are about 11 feet above the ground. Article and video available -
A lightweight portable vertical antenna for 40m