# What are these FAA facilities in Seattle doing?

While walking in Discovery Park I discovered this radar dome with FAA notices on its fence.

And not far away I cam across this small FAA signed radio antenna and shack.

Any idea what these facilities do?

My guess would be the radar is used by Seattle Center and that the small antenna is a marker beacon for southbound approaches to SeaTac.

• This is one of those questions that gives me the national security creeps. – Ryan Mortensen Sep 4 '18 at 3:44
• Does that mean I should take it down? – AllTradesJack Sep 4 '18 at 3:47
• The antenna does look like a MB antenna and it may be a decommissioned MB for Rwy 14 at BFI. It's about 8 NM from the threshold, but it's pure conjecture on my part. There are no navaids currently showing on any charts in that location. The only thing I could find in that area is the Fort Lawton RCO for Seattle Center (127.05 MHz). – Gerry Sep 4 '18 at 18:27
• "national security" doesn't depend on hiding RADAR sites, which (of course) must transmit to be effective. RADAR is easily detectable by anyone who cares. – guycole Sep 4 '18 at 20:52
• I lived in Seattle for 20+ years, and used to fly R/C gliders near that radome. At that time (early 1980s), the local glider fliers were convinced it was still active; if you flew near it, you were very prone to radio glitches (the kind of thing you'd get from harmonic interference by a high power off-frequency beam). Thirty-five years later, it still appears to be maintained. – Zeiss Ikon Sep 14 '18 at 13:56

The second picture is the NOLLA NDB (long overhead wires) along with an outer marker beacon (dual Y-arranged Yagi antennas). These two used to serve the localizer approach into Boeing Field's 13R (now 14R).