Disappointing results with my setup. What's wrong?

FlightAware ADS-B Flight Tracking
58

Try this simple-and-easy one - the V-Stub wire collinear:

Construction Details

https://discussions.flightaware.com/t/quick-spider-no-soldering-no-connector/19181/114

Sideby side test with Flightaware antenna

https://discussions.flightaware.com/t/quick-spider-no-soldering-no-connector/19181/70

Gain, SWR, and Radiation Pattern by Simulation

SWR = 1.4
Gain = 4.33 dBi / 3.85 dBi

https://discussions.flightaware.com/t/quick-spider-no-soldering-no-connector/19181/66

 

Version with 2 radials only

20211027_125138
20211027_1251381920×3950 341 KB

SWR vs Freq, marker at 1090 Mhz
SWR vs Freq, marker at 1090 Mhz1503×2297 221 KB

 

VSWR
VSWR1920×1859 198 KB