I went exploring and now have
the information. 3inches wide, 4.5oz weight, 7" length, it just fits almost exactly in the CANOPY SPACE
Rick ~
Its really not even that big (3" by 7")...

Closer to 2" by 4"... Fits perfect on the bill of my baseball cap.

Tonight I also weighed it for the first time, as I thought like they listed it was 120 grams, but actually its only 114 grams with the battery, and the required memory card which I chose the 2 GB one. The only other thing you need from the package is one of those memory stick Duo Pro or something similiar and they ranged in sizes of capacity. 2 GB is plenty for what I'am using it for, and was only $29.99 at Wal-Mart.
For fun, I took a few pics of the Webbie in case it may help ya see the size next to a few things your familiar with that you have like the DX7 and the Trex 450...
I don't think I could use it on the 450, because of the components close by and interference... But I've been trying to do some research on the different materials used for shielding like steel, copper, aluminum and carbon fiber. Different materials work better for the frequency trying to be shielded.
Anyway, here's a couple pics before I go off and play in the hobby room.

Make sure to watch plenty of Webbie vids to be satisfied...
~ Jeff