ATC: 121.5 Aviation Emergency, Snohomish County airp...
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New AI optimized scope: Focused monitoring of 121.5 Guard emergency transmissions and Snohomish Coutny, WA local flight operations at Paine Field (KPAE), Harvey, and Monroe and Air2Air frequency.

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Located at 600ft elevation near the King/Snohomish, WA county border, this feed is dedicated to high-responsiveness monitoring of the 121.5 Emergency Guard frequency comms in a range over 160 nmi and local North Sound general aviation, some KPAE traffic and Harvey Field, and Monroe airport and Air2Air comms.

Note: High-altitude traffic is mostly covered on my Stratosphere feed to preserve local channel purity. That feed pairs well with my larger KSEA/Seattle commercial aircraft feed. 

Active Frequencies Covered:

  • 121.500 – EMERGENCY GUARD (VHF Distress)

  • 127.175 – PAE CLNC (Paine Field Clearance Delivery)

  • 123.000 – Harvey CTAF (Snohomish County)

  • 122.800 – Monroe CTAF (First Air Field)

  • 122.750 – Air-to-Air Operations

Prioritization Hierarchy:

  • Tier 1 (Priority 10): 121.5 GUARD. Primary emergency monitoring.

  • Tier 2 (Priority 6): PAE CLNC. Local Paine Field operations.

  • Tier 3 (Priority 2): Harvey CTAF and Monroe CTAF. Local recreational and training traffic.

  • Tier 4 (Priority 1): Air-to-Air. Secondary pilot communications.

Technical Specs: Powered by an Airspy Mini SDR and Raspberry Pi 5 with a DPD Productions Airband antenna at 50ft AGL.