Seattle Center (ZSE) Stratosphere & Enroute

Feed 2: Seattle Center (ZSE) Stratosphere & Enroute

Overview

High-gain "Stratosphere" feed for Western Washington. Located at 600ft MSL near WOODI, this station captures the first contact for aircraft approaching from Wenatchee, Yakima, Vancouver BC, and the Coast. I've heard clear aircraft transmissions on this feed from aircraft over 160 nmi away (west of Astoria, OR).

Listening to this feed pairs well with my KSEA Arrival Journey feed to follow flights in/out of Seattle throughout the western Washington region. By listening with this Stratosphere feed, you will hear a lot of the commercial aircraft / ATC transmissions within a 100 mile+ range of Seattle on the high-altitude sectors outlined below.

Active Frequencies Covered

• 132.950 – Chinook High (Cascade Crossing corridor)

• 135.450 – Yakima High (Cascade Crossing corridor)

• 134.950 – North / BC High Sectors

• 128.450 – Wenatchee High Sectors

• 120.300 – OLM / South High Sectors (Stabilized Squelch)

• 127.050 – ZSE-31 OLM High Sectors (Co-located with 120.300)

• 124.200 – Mt. Rainier / South High Terrain Sectors

Prioritization Hierarchy

• Tier 1 (Priority 8): Primary Cascade Crossing Corridors (Chinook and Yakima). Most frequent entry points for trans-con arrivals.

• Tier 2 (Priority 5): Standard regional enroute monitoring (North, South, East, Mt. Rainier, and OLM High).

Technical Specs

Powered by an Airspy Mini SDR and Raspberry Pi 5 with a high-gain DPD Productions Airband antenna at 50ft AGL.