137 MHz Double Cross Antenna
The DCA is two pairs of dipoles, each pair crossed to produce circular polarization alongtheir support axis. When one pair is fed 90 degrees later than the other, the DCA has anelliptically polarized pattern over the entire hemisphere above it
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Homebrew antenna VHF
You build a 1/4 wavelength groundplane antenna |
L'antenne colineaire
All elements are connected to the boom directly NOT isolated from the boom, you may mount them on top of the boom or trough the boom |
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The Lindenblad antenna has ideal features for receiving transmissions from moving satellites during very low passes on the horizon. |
Laptop Mini Wireless Antenna
The size was chosen so it could be housed inside the tube of an old pen, to provide rigidity and protection to the antenna |
Log per. 144-1,2GHz
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