J-Pole antennas are ribbon cable antennas for the 2m band, or quite elaborate copper/aluminium tube versions for 6 metres

It consists of a half-wave dipole element, which instead of being fed from the center as is more common is fed from one end

L'antenna J-pole è un sistema radiante verticale costituito da uno stilo principale lungo 3/4λ affiancato da un elemento più corto da 1/4λ

The antenna in "J", so called because of its shape, is generally used on 2m and 70cm, even 23 cm and 6m

The Slim-Jim vertical antenna is of the 1/2 wave type supplied at the end end fed and therefore does not require a ground plane unlike a 1/4 wave type antenna

If the antenna is six meters long, the length of the wire should be approximately 10 to 12 inches long, if our antenna is two meters long, the length of the wire will be 8 inches less overall

J-pole is made for 146 Mhz so all of the lengths pertain to that frequency. it holds a perfect tune throughout the band

Calculating the lengths of tubing to be used for the construction of a Super J-Pole, the antenna I constructed was made of 1/2" tubin

This is made from the old flat TV antenna wire

Una canna da pesca lunga m.4,5.in configurazione jpole per i 50 Mhz

Sia in vhf che in uhf l' swr e' circa 1:1 sulla porzione di banda che mi interessa

È una antenna omnidirezionale j-pole per le VHF

On most of the J Pole designs out there, a choke should be used as close to the feedpoint of the antennameter

J-pole on the bottom end the two conductors of the twinlead are twisted together and soldered

The antennas were tested on 2 m, 6 m, 1 2m and 30 m. The lengths for the bands marked with, have not been tested, try with he given dimension

J-pole antenna tuned for 89 MHz in the FM broadcast band

Cut the 20mm pipe in two part: 150cm and 50cm; in the same way cut the 16mm pipe: 60cm and 20cm; join the pipes at the following way

Slim jim 145 Mhz antenna can be made very easily

The Slim Jim is a vertically polarized omnidirectional end-fed antenna having considerable gain

The Super J Pole a.k.a collinear antenna

How to make a weatherproof vertically polarised omnidirectional aerial, the slim jim antenna

If the antenna is to be placed outside, do not use brass, photo model designed for 2.45 ghz. a capacitor of 0.8 pf and it would be perfectly matched to 50ohm

Calculating the lengths of tubing to be used for the construction of a super j-pole, the antenna i constructed was made of 1/2'' tubing