hi gain antenna

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ZR6KMD 2M Beam Antenna - This design was adapted from an article in the ARRL Handbook and built with simplicity and duplicity in mind. This antenna is a vast improvement over a standard dipole with a forward gain of around 8db with a front to back ratio of 10db.
[ Hits: 2222 | Votes: 1 | Rating: 2 ]
Slim Jim 2m Vertical - This VHF 145 MHz antenna is easy to build and with no radials. It shows equal gain of 5/8 lambda. It is light weight, you can hang it somewhere (on a tree may be) and work.
[ Hits: 3391 | Votes: 3 | Rating: 6 ]
3 elements VHF yagi antenna - 3 elements VHF Yagi homebrew antenna designed with YAGIMAX 3. Maximum forward GAIN is about 8,17 DBi. This antenna offering an effective radiation power 4 times greater of the transceiver output by SV1BSX
[ Hits: 14043 | Votes: 59 | Rating: 4.51 ]
The Tiny 3 - Similar to Tiny 2 but this three element direct connect antenna utilizes a reflector and a director to achieve gain.
[ Hits: 1254 | Votes: 4 | Rating: 8 ]

The 50 MHz DK7ZB Quadlong - The Quadlong antenna for the six meter band. This antenna feature a total gain of 6,4 dBd, F/B 21 dB and is also available in 70MHz version. Includes detailed pictures and plot diagrams.
[ Hits: 1440 | Votes: 27 | Rating: 9.04 ]

ZS2FM 50MHz High Gain Antenna - An high gain long yagi antenna, seven elements, for six meters band
[ Hits: 948 | Votes: 0 | Rating: 0 ]

Quadrifilar Helix antenna for 436 MHz - This is an antenna that author just built. Was intend for receiving the AO-27 downlink (at 436.800 +/- doppler). It is built with right hand circular polarization, and the gain is supposed to be in the neighborhood of 3 DB.
[ Hits: 3896 | Votes: 4 | Rating: 4.5 ]
Portable 70cm Quadruple Quad Beam - A suitable high gain 70cms antenna for SOTA operation was sought that did not have the drawbacks of a long Yagi antenna, principally a narrow beamwidth and bandwidth.
[ Hits: 3548 | Votes: 3 | Rating: 8 ]
High gain vertical antenna for UHF - How to build a high gain vertical antenna for the UHF amateur or CB Bands, by radio experimenters handbook
[ Hits: 3758 | Votes: 7 | Rating: 5.71 ]

Omni-Gain Vertical Collinear Antenna - This rugged antenna, an omnidirectional collinear, is capable of surviving harsh environments. It's a good choice for repeater installations and can be top, or side mounted to the tower by WA6SVT
[ Hits: 10745 | Votes: 7 | Rating: 4.86 ]

Inverted Vee monoband antenna - This project will enable you to build a monoband long wire inverted vee with 3/4 wave length sides that will have a bit of gain
[ Hits: 2263 | Votes: 1 | Rating: 10 ]

Gain of Helix - This article summarizes probably the most extensive numerical modelling calculations on the helical antenna ever performed.
[ Hits: 1890 | Votes: 2 | Rating: 8.5 ]

Antenna Gain Comparison System - This device goal is to optimize homebrew antenna for the V/UHF band. This tool, is based itself on the simultaneously comparison between two antenna, directly in dB. by IK0BDO
[ Hits: 2212 | Votes: 12 | Rating: 5.58 ]

BiQuad Antenna for 144/440 - This is a vertically polarized Broadside and Collinear Array each Loop is a vertically polarized Broadside Array both the right and the left side of the Loop is a bent 1/2 wave dipole working 180 degrees out of phase with the other one and that gives you 4.15dbi of gain by KE4UYP
[ Hits: 7600 | Votes: 14 | Rating: 4.86 ]

A Brolly Dish for AO-40 - A umbrella dish. Portable high gain antenna for AO-40
[ Hits: 1900 | Votes: 2 | Rating: 9.5 ]

Antenna Measurements - The electrical characteristics of an antenna that are of interest to obtain by direct measurement are the frequency at which the antenna is tuned, the gain and radiation pattern
[ Hits: 946 | Votes: 3 | Rating: 4 ]

Corner reflector antenna - Do you need a high gain antenna? Have you suffered on picking up interference from unwanted direction? You need a directional antenna but a 12 element Yagi will be too attractive!
[ Hits: 1709 | Votes: 4 | Rating: 3.75 ]
Antenna Gain - How much gain ? This article help you on understanding how read antenna gain values in order to evaluate antenna performance
[ Hits: 5321 | Votes: 9 | Rating: 5 ]
Antenna Gain to ERP - A radio's transmitting power can be concentrated along the horizon by use of a GAIN antenna. Although you may still be transmitting with four watts of power, your effective radiated powerwill be greatly increased. This table shows the effects of antenna gain on a transmitter with 4 watts of transmit power.
[ Hits: 1386 | Votes: 4 | Rating: 4.5 ]

A 2.4 Ghz High gain antenna ^pop - Here is how to build a high gain antenna for 2.4 gHz wireless networks. Several hams are experimenting with these devices in an effort to build a network. It is sometimes referred to as Hinternet or HSMM.
[ Hits: 61435 | Votes: 91 | Rating: 5.53 ]