replacement antenna 5kcstq

[Barry Babcock]

Anybody know where I can get a replacement unit?  Would something like 
this be a good way to go:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33639&item=2454624835

The mast is broken on mine, and I think the mechanism is toast too...

I'm trying to install an aftermarket sony head unit-- I don't know how 
to wire in the power antenna- any BTDT on something like this?  Am I 
going to have to wire in a separate switch to operate the antenna 
whenever I want to listen to the radio?

Thanks as always,
Barry