A four element Yagi Antenna for 50 MHz band. The reflector and the director elements can be mounted directly to the metallic boom, while the Driven element must be insulated from the boom. The driven element is basically a simple folded dipole and foreseen a 4:1 balun. Usage of a folded dipole as driven element
A homebrew 13 elements yagi antenna for 144 MHz by I5MZY
An homebrew dual band j-pole antenna
A Dualband QUAD made with two identical square loops, whose sides measure a quarter wave (?/4), connected together
Dimentions Elements A, B, C spacing between elements 119.38 cms. E 1 Reflector 1: 304,8 cms. E 2 Radiator : 274,32 cms. E 3 Director : 271,15 cms. E 4 Director: 269,24 cms. D Distance with gamma match: 35, 56 cms aprox. E Gamma spacing: 7,62 cms. F Gamma tune: 50,8 cms x 12,5 mm
A good antenna that can be used for the car as well as the house is an HALO. This antenna maintains good omni-directional horizontal polarization. Basically the antenna is a half wave dipole bent into a circle,BUT shorter than a dipole for this frequency. The circumference is 60-70 inches. By useing the gamma match (see
Use a 54” piece of 450 ohm Ladder line. Cut out 3 inches of the center part of the ladder line. Solder a PL-259 on the bottom of the Ladder Line (both side of the ladder line will solder on the ground side of the PL-259 – this is used for the shorted part of
I recently had a conversation on the radio with another Ham who had built a 6 Meter wavelength band “J” antenna. He was getting some rather strange performance from this design, so I asked him where or how he had come up with the antennas dimensions. He referenced an Internet web page to me where
The information in this article has come from many amateur sources, the most notable was from WA6TEY (sk 1985) Ray Frost, who was a pioneer of VHF Quad designs and one of the best Southern California Transmitter Hunters of the 1980’s. Ray built hundreds two meter quads in single and paired configurations as well as
The mirror-image J-Pole is very easy to construct and requires only two T-Fittings plus a length of copper pipe.To visualize the antenna, one must only picture a 3 half-wavelength vertical and a 2 quarter-wavelength vertical positioned a few inches away from and centered on the the tall vertical. Construction of the mirror-image J-Pole is accomplished