Same Setup/location total different results

@flieger28
Did you try Quick Spider?
It costs pennies, and is easy to make.
It may possibly improve. No harm in trying.

https://discussions.flightaware.com/t/three-easy-diy-antennas-for-beginners/16348/8

The only drawback is that you will need a pigtail or adapter to connect RG6 coax to your Dongle:
F-female to MCX-male for generic DVB-T
F-female to SMA-male for Flightaware ProStick.

F-male to MCX-male Pigtail

.
F-female to SMA-male Pigtail