Does the FlightAware 26" 1090Mhz have built in groundplane?

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This is the comparison of FA 26" /66 cm Antenna with DIY Cantenna which I did in June 2016.

New, inexpensive 1090MHz antenna for sale

The FA Antenna+FA Filter+ProStic is the best option I have used up to now. I have 2 setups. My stats show the FA combo gives much better performance: Message rate 182%, Plane count 114% Pi-1: Cantenna + 12 ft RG6 Coax + 12 inch RG316 pigtail + Black DVB-T (No Amplifier) >> plugged directly into OPi PC Pi-2: FA Antenna + 4 ft RG6 Coax + 4 inch RG316 pigtail + FA Filter + ProStick >> plugged directly into RPi Model2 Note: (1) Both antennas are at same location in same vertical line. Horizon…