Troubleshooting NooElec Radio

I have a NooElec SDR on a RaspberryPi. According to My ADS-B, it’s live; however, it’s not tracking planes anymore.

How do I troubleshoot the radio?

Thanks

NooElec NESDR Mini 2 SDR & DVB-T USB Stick (RTL2832 + R820T2) with Antenna and Remote Control

sounds like problem with antenna, try to replace then, or check inside for cable damage.

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