what will a radiator replacement cost?

My antenna wont retract - repair or replace.

 

or leave the antenna extended?

I get good new radiators for $130.00 from performance radiator in Seattle WA. And they will ship them.

You can get them a lot cheaper than that online on ebay.

You might want to splurge and go with a fully aluminum radiator meant for the Legacy (aftermarket) as the plastic can be brittle after time, and the dumbest idea of having high pressure hoses seal on plastic tubes.....

 

What ever you get, use anti-seize on EVERY bolt, including the ones going into plastic as I've sheared my share of them.

 

If you don't care, revert the antennae to a normal one that doesn't retract and call it a day, or go with used and replaced the assembly. If junk car has it in down position, chances are it's OK. I have a hand drill that's 12v, or actually closer to 14 when charged (use voltmeter to ascertain 12v+ and attached wires to it), and it's got enough juice that if jumped directly to a seat, it can move it, same deal with windows, etc. Connect to the power antennae and see if it goes up/down fully. May need some fresh grease.