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Are you looking for a generic type of power antenna, or a reproduction of the original antenna, and do you have the factory installed CB?
There are generic power antennas available from most Corvette parts vendors, for around $100.
Th repro of the 78-82 original antennas have been back ordered for sometime now, but I understand that they may be available again in May. The repros go for around $160.
If you need a power antenna for the AM/FM/CB radio, your out of luck. The CB antenna has not been repro-ed, and I'm not aware of any plans to do it anytime soon. The only option for the CB antenna, is to try to find a good used one.
Generally the antenas can be rebuilt, pretty easily. 9x out of 10, the chord breaks and can be replaced. There is a nylon chord inside that spools up/down around a drum everytime the antenna goes up and retracts. After years, it gets brittle and eventually breaks, usually where it attaches to the drum. This is an inexpensive fix, and it isn't too much work if you are handy. I've done a few of them. The first time will probably take you an hour. You can still get the replacement mast. There is a guy on the internet that sells replacement antenna masts (google antenna masts). Of I recall it's about $22. BTW, it is the same unt they used on Cadillacs in the 90's too. You can find other posts on this forum on how to replace the mast.