Here is another quadrifilar helix antenna design, this time for ADSB (aircraft mode-S transponder) reception at 1090 MHz. Unlike other antenna types this antenna has a spherical coverage with 120° 3dB beamwidth and estimated peak gain of 4.6dBi at 1090MHz.
Finally my Kickstarter pledge, the piDrive from Gungho Labs, arrived today. While I was very excited I took the chance to install the piDrive to my existing Raspberry Pi server.
Here is another project you might be interested in: