yeah, i agree that the stock antenna is a good one... when it goes up and down properly... mine got totally screwed up, so I just unpluged it when it was up... I then replaced it with an aftermarket power antenna... and that one got kinked... so I went custom, and mounted a S2000 antenna there... now I dont get shyt for stations... but it looks cool.
The mast assembly is not cheap... you're lookin about $50-$60 at the dealer...
www.hondaautomotiveparts.com has it for cheaper.