The center section of my power antenna will not extend. What do I need to repair this?

 

You mean it only extends part way?

 

Yep

 

See if you can gently pull it free, and then lubricate each segment with light oil.

 

Tried it w/wd40 and pulled up several times, NG.

 

perhaps a section of it is bent,causing it to bind.

 

just a thought, but in high school we were taught nopt to use oil.

The oil attracts and catches dirt adn what not which jams up the antenna.

Instead we used brake clean/degreasser and removed whatever dirt. It seemed to work pretty well.

 

Not bent, manual says to use light oil.

 

have you tried cleaning it with the degreasers first?

Even if you oil it up it won't really help if its all gummed up and dirty.

 

I havn't removed it from the car yet. I was hoping the wd i used would loosen it up. Will check tomorrow.

 

After using WD and exercising the antenna up and down (hopefully it will free-up and work), lightly wipe the antenna with a dry clean rag. This will remove any access oil to help prevent the dust and dirt from accumulating on it. The very light WD residual film left behind will be all it needs for lubrication (provided it's working properly).
If the above doesn't solve your problem, you then likely have an internal antenna drive mechanical issue.

Good luck.