Saturday, 17 September 2016

Comparison: Four ADS-B Antennas

Comparison: Four ADS-B Antennas

Should you fork out $45 for a FlightAware antenna?
Quarter wave (2.7 inches / 6.88 cm) or Half-Wave (5.41 inches / 13.76 cm)?
How does Nooelec's 5dBi antenna perform?
To find out, I used four Raspberries with PiAware and four SMARTs (review link, manufacturer link).



Antennas tested



1. Nooelec 5dBi ADS-B antenna, $6,
2. Large FlightAware antenna, $45,
3. Telescopic supplied with SMAart, extended to half-wave on metal plane cost: $0,
4. Telescopic supplied with rtl-sdr.com dongle, extended to quarter-wave on metal plane, cost: $0.




Location



Outdoors on a first-floor windowsill, top of antennas at the same level, height above ground 4 meters, overlooking local international airport and Europe - USA flight corridor.
Same vertical plane, but not in the same horizontal location; polar plots might reflect slight positioning differences, but for all intents and purposes except serious hair-splitting, differences are negligible.

Results


Maximum range at 250 degree indicated on plots from Planefinder, all data from FlightAware.





Large FlightAware antenna was best performer, unsurprising considering its humongous size and $45 price tag. To get the most position reports, it is the antenna to buy.
Half-wave came in second, 22 percent difference in total reports received versus FlightAware antenna.
Nooelec's 5dBi high gain antenna is a solid performer for $6, 44 percent less position reports than FlightAware's significantly larger antenna.
4. Quarter wave antenna had worse performance than any other competitor. Cutting black solid antenna supplied with Chinese dongles back to an interim solution, but it's a solution nonetheless.

Draw your own conclusions, data is above.

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