I decided to use one of my long PCB antennas for a mobile ADS-B box that I can use in the car when visiting a local airport (KADS) to watch/listen to planes land during lunch. It’s a busy non-commercial airport with +170 jets based there and around lunchtime, there always seems to be 3 aircraft in the pattern with 3 ready to take-off (singles, twins, or jets).
By connecting the ADS-B through my phone’s hot-spot, I can use a tablet/iPad to pull up Skyview to get a real-time view of the aircraft in the air and on the ground. The PCB antenna worked great, tracking +100 aircraft - I did have to dial down the gain to 29.7 because the aircraft in the run-up area were not being displayed because their signals were too strong / they were too close (1/4 mile) .
The 2nd pic below shows the 12V to 5V DC-DC converter that allows me to use the 12V straight from my car’s cigarette lighter.
I designed the case using Tinkercad and 3D printed it using PLA filament.