Yes, you can convert. Talk to jr's3800 for details.

If you properly maintain your antenna, it'll never jam. If the core breaks, you'll know it when the battery drains the first time. Well worth the trouble, IMHO.

No, it'* the kickback that shuts it off: it doesn't matter whether that comes from hitting the end of travel on the antenna itself (either all the way up or all the way down), or from too much grime and gunk on the antenna shaft; either way the pushback is what opens the contacts. Heck, if you want, try holding your hand over the antenna as it comes up, and it'll only push upwards so hard before it gives up. (It may resume going up after you take your hand away, though.)

The wiring in the dash harness at the head end almost certainly includes the power antenna lead, as it'* been standard wiring for decades (e.g. in the mid-'70s to early-'80s stereo harnesses, the power antenna lead was the fourth wire in the power connector, along with the switched power, ground wire and dial lamp feed), but if the car wasn't originally equipped with a power antenna, the portion of the wiring harness running to the back of the car may not be there. So even if you do have a wire meeting up at the back of the stereo (and I think you probably do), it may lead no further than a few feet away and end in an open connector somewhere.

You'll need to take a look for yourself, but start back at the trunk end: if the wiring is there, it'* probably connected all the way up to the front as well.

the power antenna on my delta is stuck 9/10'* of the way up... the previous owners solution was to pull the fuse... but then ofcourse the stereo didn't retain any memory, the seatbelt light stayed on, and my "reminder" lights other then headlights didn't work... while I was checking over the brakes on the car I just undid the screws for the inner fender and cut/wraped the power wires... the antenna itself still works great... if I can't sell the car I'm gonna totally remove it "shave" the hole and swap to aftermarket interior/window antenna (with my stereo finally installed I don't listen to radio that much)

most decks use the remote turn on lead (usually for amps) to turn on the power antenna... newer ones and good quality ones have a second lead for the power antenna

Okay, that'* one solution... but don't you have an in-line connector with about three wires going through it, near the right-side hood hinge under the hood? I think one wire is a black ground, one is green, and I forget what the third one is. That'* the harness connection to the antenna motor, which will disable only the antenna motor while leaving the rest of the circuit intact if you unplug it there. (Kind of late now, in your case... )

I had problems buying a new exact fit GM antenna for my car. So I purchased their recommended replacement and it turned out to be a custom install... 2 hours.

:(

I took the shell of my 93'* power antenna, The upper mast from the 87, and the gears out of a 95 caddy to make my antenna, and the only part I had to buy was the four 1/4-20 bolts to put it back together... Now that'* Shadetree