If you have any interest in antennas at all, fasten your seat belts and hang on to your hats, because what you are about to read here is going to blow you away. Conventional wisdom concerning antenna matching and resonating is about to be shattered and the principles revealed here might just be the start…
Category: Homebrew
7 elements Yagi-Uda Antenna for 144 MHz
An original project by I0QM of a 7 element yagi anetnna in a PDF File. The QM7 antenna is a simple 7 elements Yagi with 3.7 m boom length for the lower 144 MHzSSB/MGM band forward gain is 1.35 dBd; i.e. 13.5 dB forward gain over the isotropic radiator, while the F/R is about 12.5…
Rhombic Antenna
Rhombic Antenna dimensions and plan for HF and VHF bands by N6JSX
Boomless Quad
A Quad antenna is a full wavelength conductor in the form of a square (or circle or diamond). It is actually two half wave dipoles spaced half wave length apart, bent at right angles at l/8th wavelength points and joined together. If the Quad is fed at either sides it is vertically polarized and if…
A 1:1 Coaxial Balun
This balun documented by I0QM use a ¼ wavelength and the ¾ wavelength adapting sections with the 50-Ohm coaxial cable, or a coax line with the impedance you need.
6 Element Log Periodic Yagi for 6 meters
G3SYC began designing and using a LPY on 6 metres in 1991. Since then he has refined the design and has worked some superb dx from his qth in IO93. The design featured here evolved in 1996, and is the mk2 version. This yagi antenna has a very clean polar pattern and a good front…
The Stacked J-Pole
First build a regular MonoBand J-Pole from the Copper Cactus plans for a 2-meter antenna, leaving off the top pipe cap. Build a second J-Pole, which will look like an L-Pole, the vertical is 38-3/4 inches from the top of the antenna, down to the centerline of the horizontal member. The lower leg of the…
The Adcock HF RDF Antenna
The Adcock antenna has been used for a long time for RDF. It is basically an interferometer. When both of the two dipoles see exactly the same signal strength and RF phase, no signal is delivered to the receiver. This condition happens only when the signal source is equal distance from the two dipoles. As…
An Improved Multiband Trap Dipole Antenna
You need this—traps with lower loss, higher Q, increased power-handling capability and four-band coverage! This improved multiband trap dipole introduces a new trap design and a change in trap location. The antenna features double-coaxial-cable-wound traps having lower reactance and a higher quality factor (Q) than earlier coax-cable traps. . Article published on QST, author and…
3 Element 28 MHz light weight Yagi
Background: In the solar maximum years 28 MHz is full of DX stations, that can be worked with very simple equipment. However the fun will be even greater with a proper antenna. So I decided to build a 3 elm. yagi and took the design from ARRL’s: “Yagi Antenna Design” by W2PV. But I also…