Futaba FASST 2.4gHz receiver antenna replacement PN: HSP79452
Just went through a tough search to find a replacement PN for my futaba FASST receiver and wanted to post the results and save some others the hassle.
The case is easy enough to open up and the antenna has a coax connector that pops right off (no solder required) on my R603FS. I believe it will also work on models R603FF & R604FS.
For some reason, Futaba does not sell it direct. Google or have your LHS order it for you.