RE: another 7C question...antenae?
If you're that curious you could always ask Bill and Krysta in the Futaba Direct Support forum but things like that get updated or changed over time as suppliers change so I wouldn't sweat it. The actual antenna for a 2.4 system isn't but 2.5cm, the rest of that is just a casing to get it a little higher and away from the rest of the electronics.