Have recorded a new range peak in dump1090 running the Mode-S Beast together with a G7RQG antenna – 488km.
After successfully testing of my G7RGQ antenna here my built details:
With above dimensions the antenna is tuned to about -22dB return loss at 1090MHz when placed inside the PVC tube.
Here is another one. Huge thing this time, designed for 433MHz, polarization RHCP. For dimensions etc. see design description below.
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.
Here is another DIY antenna, this time for GSM/3G/4G usage. The design was calculated for 800-2100MHz and works well in this range. The antenna has a very broad bandwidth with a low gain and can be used for any application within the frequency range. Since the results are very good even up to 3GHz the antenna is also useful for WiFi. As well as ADS-B (flight radar) because 1090MHz is covered too. In general an excellent antenna for rtl-sdr operations.
Based on this calculator.