AirView2-EXT 2.4GHz low cost Spectrum Analyzer from Ubiquiti with external antenna and connector. :: ICD Group, Inc
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Oscium Dual Band WiFi Spectrum Analyzer 2.4 & 5 GHz
Triplett WiFi Hound 2.4 GHz and 5 GHz Wireless Network/RF Spectrum Analyzer to Visualize and Troubleshoot Wi-Fi Issues for Smart Homes, Businesses, and More (WFHOUND): Amazon.com: Industrial & Scientific
HSA2030A Handheld Digital spectrum analyzer Portable Field Strength Meter 9kHZ 3.2GHZ AC Coupled USB interface WIFI/LAN Optional|Spectrum Analyzers| - AliExpress