So! Tomorrow I'll be heading back up with a camera for photos. I would have today but I'm not to keen on having the cops called on me a third time for taking photos of a school during hours

For now, here's a view down from bing where you can almost but not quite see the stripes.
http://binged.it/T3iB74
And here's a cropped photo I just found on Google which doesn't show the stripes, but it does show that the horn opening is black while the housings for the chopper and motor are yellow.

Againj, I'll be back up tomorrow to take photos of it myself.
Also some bad news: there's a 2001 (I think DC, didn't get a good look at it just driving by) on a pole next to the parking lot. It's not present in the bing overview, but it's congruent with the city's plans to replace the cold war sirens fairly soon. If I were to have the opportunity to buy this siren if they take it down I'd love to but at the moment wallet says no.