The antennas may be installed at height near one meter above the ground, resonance counterpoises should be used at this placement

The antenna 32ft. long insulated wires supported by fiberglass push up masts at aprox. 40 ft. high. somebody wanted me to try a 2 element reversible vertical array

Hopefully this will help others looking for a good 80m/40m antenna, i have enjoyed this antenna project and it works very well

This antenna it just clips onto the mobile mount instead of the whip, the other end is hoisted up into a nearby tree or support

With the wire lengths shown and supported by my 9m squid pole, i got swr less than 1.3:1 on 7.100 mhz and 14.200 MHz

The secret with this antenna is to install as many radials as you can around the base of the antenna, they can be anything from 1/8 wave or longer

The body of the aerial needs some special constructive elements to tune it into a resonance within different amateur bands, these elements can be concentrated (lc, l, c)

5 Band 1 4 wave telescopic antenna the 20m to 10m antenna is simple

The antenna tuning unit used with this 27m titanex vertical was originally designed to operate on 40, 80 and 160m

Made from 3 inch aluminum irrigation tubing 0.050,i use this mast design for inverted vees and verticals six of them for 80 meters for the verticals i use 2 inch tubing for the top 30 feet, since it doesn't have to support anything

It is essentially a very short dipole with spiral-wound coils at each end, each coil contains a quarter wavelength of wire at the desired antenna frequency

The radiator of the 40 m band is an independent rod separated from the main 10 cm, with a load in the center and a height of 4 m

Supporto canna da pesca in vetroresina da 10 metri

L'antenna risuona senza accordatore in 40m, ho utilizzato due radiali sotto forma di spezzoni di filo elettrico lunghi circa 10 metri

Copertura continua da 1.8 a 30 MHz, altezza complessiva compreso supporto di base di 8,6 metri, adattatore di impedenza alla base, 5 radialini alla base di 50 cm, 4 elementi telescopici in lega

Slope che vuole dire inclinato, indica un dipolo completo teso tra una sommità e il suolo, l'alimentazione è fatta nel punto più alto, ossia alla sommità del palo o traliccio

Vertical multiband antenna with semi-small radiators, bands 14, 21 and 28 MHz

Questo tipo di radiatore sfrutta un principio di funzionamento molto differente da quello usuale di 7.5m tipo la Ribako

Questa antenna è alta m 27,60 e richiede un piano di terra costituito da una cinquantina di radiali lunghi circa 40 metri

The vortex super j-pole antenna consists of a five eighth wave vertical radiator, a half wave tuning section and a half wave top section

It is a vertical multiband antenna composed of several radiating elements lambda / 4 length fed by a single coaxial cable

CB modified antenna for the 12m a quarter of a wave

18m telescoping pole, i turned it into a great 160m through 30m antenna, as a bonus it makes a good tree surrogate to hang a 15m dipole

I started by modeling the basic 80m, 40m antenna, below are some results from mmana assuming an antenna length of 10m

Broadband HF Vertical antenna which does not require a tuner, and which is capable of providing moderate performance on all bands from 7MHz to 28 MHz reduced performance from 3.5MHz to 51MHz

Linear-loaded vertical doublet has been doing an excellent job the past two years, but it's time for a change, i've wanted to play with a twin-t capacitive loaded vertical doublet design

At a height of lambda / 4 from the ground, the radiation pattern is close to that of a vertical quarter wave on a ground plane, with a starting angle of about 15 degrees on the horizon, favorable to the DX

This paragraph is about how I added" 30 meters to my 20/40 meter short vertical

If you are operating below 21 MHz,it is all but impossible to run a full-sized mobile antenna, so some sort of loading coil will be needed

The design of this field day antenna is not very novel and leverages ideas from butternut verticals and arrl publication

The main requirement is to get it positioned in the clear, away from buildings if possibl

Back home i compared the roof mounted groundplane antenna with an identical model on top of my camper, the same story the lower mounted antenna worked better

The overall height of the antenna is approximately 48.6 feet, the radiation resistance on 80 meters is approximately 25 Ohms, and 35 Ohms on 40 meters

Another common question is does it matter if i lay the radi-als on the ground surface instead of burying them this is a practical consideration because it's often much easier to lay out the radials on the surface

Un'antenna verticale per le bande basse per gli 80 e 40 metri

Building a half wave antenna for 20m radiator I took 10 meter wire, 2.5 mm thic

160 meter antenna is an Inverted L, the length of wire required at 1.835 MHz is approximately 127 feet

When 3 bands are used a center pole and 2 wires on the sides are used,the center wire will always be the lowest band and to the sides the other two or four bands

The antennas may be installed at height near one meter above the ground,resonance counterpoises should be used at this placement

The antenna consists of three sections of wire and two coils, the antenna is only 30% of full size on 40 meters

Operation portable j-pole antennas for 2m-40m

Physically shortened 160-meter vertical antennas of considerable interest

Diameter: 62 mm coil height 83 mm / Full height 121 mm after cutting off a part i didn't need Coil turns 28

It is about making us a GP ground plane antenita for the VHF band, its main feature is its reduced cost

Two lambda / 4 vertical antennas marked A and B and placed at a distance equal to lambda / 2 are fed simultaneously by the same signal in transmission

I have decided to build a ground plane vertical antenna for the 20, 15 and 10m bands and hopefully reach a few trans-atlantic station

I decided on a terminated inverted U fed from one end and terminated at the other

A simple, cheap and easy to build 26 feet long vertical antenna that works DX on 10 20 meters including warc bands

Commutare alcuni sloper per le bande basse senza aumentare il numero di discese di cavo cossiale

Nelle bande basse, per togliersi diverse soddisfazioni un sistema array di due verticali in fase può rappresentare un ottimo sistema, specialmente in banda 40 metri

The telescopic pole consists of cylindrical aluminum tubes, with diameters of 35, 30, 26 and 22 mm

Antenna verticale per bande basse a reattanza differenziale nelle configurazioni,40/80 -- 30/40/80 -- 40/80/160 -- 30/40/80/160

Fancy a cheap, collapsible self-contained portable antenna for 80, 40, 30, 20 and 15m that works really well and can be erected in minutes

Antenna has enough good parameters at the 40 and 20 meter Bands,antenna does not need any counterpoises, antenna should place at some distance say more the 1- meter above the ground

I was amazed when i first learned of the tak-tenna reduced size dipole on hamuniverse.com

Antenna MFJ-1954 copre da sola i 20m ma con una bobina posso anche utilizzare i 10-12-15-17 metri

L'elemento riflettore e i radiali sono isolati da massa, i tratti verticali posono venire accorciati mantenedo inalterate le caratteristiche di spaziatura e dei radiali

Antenna height 6,5m impedance in point of power supply 50 ohm swr 1.5:1, or less power limit 1000w bandwidth at 2:1 swr

Verticale funzionante nelle bande radioamatoriali, principalmente dai 160 ai 40 metri utilizzando uno stilo di diametro 5 cm, decrescente a 1 cm alto 12 metri

L'antenna è 1/4 d'onda caricato, la bobina è realizzata con filo 0,8 su diametro da 70mm

Antenna verticale per i 40m - 17m , i risultati migliori si ottengono con un ricco piano di terra 10-20 radiali

Vertical dipole for 20m no coils, and 40m loading coils, 4.8 m tal

The linear loading assembly functions also as a supporting guy to prevent element sagging, i think the m-squared folks were very creative in this

This 40m yagi, which shows very high performance on our tests, isn't ispired from any other model. lots of yagi models are analyzed and this model figured out, the most spesific part of this model is having belove 1:5 swr value and 175 khz bandwith

The vertical antenna looks to be the perfect low angle radiator, except for one thing the height of a 1/4 l at 80 metres is 20 metres, or 66 feet, which is not practical to construct

Short ham antennas are not as efficient nor as effective as a full length half wave dipole regardless of the configuration chose

Linear loaded dipole on both sides by 1.8 m in order to cover the 20 m band, swr is ok without modification of the 1 : 4 transformation line

Coil loadded dipole tuned for 48/80 m band project

A vertical loaded vertical antenna for 160, takes up half of the space of a dipole, being fed from above, the high current part of the antenna is at the top, thus improving radiation

Amateur radio activities on the hf bands i only have a 3.6 m wide balcony available for antennas, after some study i decided to experiment with a shortened dipole for the 15 m band

This is a vertically and horizontally polarized antenna the Linear loaded 1/4 wave length vertical radiator introduces very little loss, the over all radiation efficiency is high at 80% to 85%

The and simplest way the construction of a rigid, rotating dipole with linear load for the 40 meter band

This is a vertically polarized phased array. the left vertical wire is 180 degrees out of phase with the middle and right vertical wire, at 1/10 wavelength spacing from the right vertical wire to the left vertical wire it is producing a end-fire bidirectional pattern,that developes a gain of 5.9-dbi