Sending High-Definition Video over Long Distances

I'm working on increasing the quality of video sent through the Cathedral Basilica of St. Louis' in-house video distribution system (right now they use passive composite video connections over Cat5 cabling, and video is very blurry with lots of ghosting), and I thought I'd briefly share my findings in this area.

I've decided to go with an 'active' (powered) video send/receive unit, from Knoll Systems:

Knoll US-V3 Sender