To get down the guy wire, here's a technique I used once:
Anchor the line to the tower. Tie off to the end of it (short of the ground) so that if you end up falling you just ride the line, instead of cratering. Clip yourself into the guy wire using a short runner attached to a steel 'biner. Rappel down the line (sliding down the wire) until you get where you are going. Use ascenders to climb back up the line (sliding yourself back up the wire) once you're done. Alternately, you could just rap (and slide down the guy wire) all the way to the ground.
If you're trying to rescue an injured jumper, you could run a Z-rig inside the tower, so that a second rescuer could haul the two of you back up to the tower.
If you haven't seen it, a good reference is
How to Rock Climb: Big Walls, which has a lot of good information on how to rig hauls and rappels (climbers use those techniques to get a whole bunch of gear up the side of multi-day climbs).
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