Re: portability, my next step is to remove the stick and replace it with something I can attach to a tripod. Regarding the weight, it really isn't that bad in a backpack. I actually was trying to simulate the mass of a head.
Re: explaining it to the police, most places I record are out in the boonies so I don't expect I will encounter any police. Also the color and texture makes it blend in quite well in many environments.
http://farm4.static.flickr.com/3401/3200175490_d047450f71_b.jpg - The "head" is made from a piece of carpet pad wrapped up, with lots of scrap fishing net wrapped around it. It weighs about 8 pounds. The stake goes up inside the carpet pad. In the backpack is the rest of the recording chain - Sound Professionals binaural mics->Sound Professionals amp->Sony Digital8 camcorder.
One of the coolest recordings I've ever heard. I agree that it sounds eerie, and that just adds to the "power" of this recording. Thanks for posting this. I'm glad you had the wherewithall to record it! Nice work!!