You can read about this antenna here www.g0mrf.freeserve.co.uk
Freq : 5.6Ghz Gain : 10Dbi Beamwidth : 55 deg
All building instructions are on the site.
Posts Tagged ‘802.11a’
5668MHz Helix Antenna
Saturday, October 27th, 20072100 – 11000 MHz LOG PERIODIC ANTENNA
Saturday, October 27th, 2007(2.1 – 11 GHz)
This log periodic printed circuit board antenna gives great performance from 2100 – 11000 MHz. This range includes wireless networking at 2.4GHz (802.11b/g) and 5.8GHz (802.11a).
Here are dimensions of this antenna.
http://www.g0mrf.freeserve.co.uk/cband.htm
And a link to a site from were You can buy this only for 12$
5 – 6 GHz Helical Antennas
Thursday, September 13th, 2007
Wow ! It’s a surprise for me to see that helical antennas are working so good on 5ghz to 6ghz band. Here is a company that selling them http://www.q-par.com/products/helical-antennas/5-6-ghz-helical-antenna
GAIN ~10 to 11.5 dBic by specification -who knows 
So if You like to try 5ghz wireless links, You may try helical antennas . I’ll be waiting for results if someone try to build and test this.
Here is the picture of one of this – nothing unusual really:
