So if you are getting a white light, the SDRx is getting power from its USB host. Then, I see you did the SDR# test on your laptop with the SDRx. This should have yielded some signals. It looks like the SDR# is able to “see” the RTL-SDR on the SDRx board. However, we are not getting a lot of signal from the SDRx.
The antenna is so simple that I’m doubting that it’s the antenna’s fault. Do a visual inspection…
- Is the coax bent or broken anywhere?
- Any cold or intermittent solder joints?
Do you have a regular RTL-SDR dongle? If so. you should be able to pick up all sorts of things with the patch antenna, the RTL-SDR and your laptop, specifically around 1090 MHz (ADS-B), perhaps some other activity in the lower half of the L-Band (1 GHz to 1.5GHz). It this works, then you can rule out the antenna and with confidence say it’s the SDRx board.
The LNA’s are very sensitive to electrostatic discharge (ESD). You may have blown the LNA. I would prove that on a bench by injecting a signal right behind it, before the SDR.