Useful Coordination Tools

Below are some mapping resources that you may find useful.
Coordinate Conversion Untility
TopoZone Topographic Maps
US Geological Survey Search
TerraServer Satellite Photo's
What's my Gridsquare?
Airport and Navaid Locator
Yahoo Maps
Address, phone number lookup.

If you're putting up a repeater on an existing tower, you may want to look up information about the tower and what other servicesare located there. The FCC search site allows you to do that based on Call, latitude and longitude, county and state, etc.. Note this site takes some practice to learn all the "features". .
FCC Universal Licensing System
FCC Antenna Structure Registration
FCC Commercial Database Searches
SERA Coordinator Online Database "Coordinators Only"

Here's some links to Antenna, Transmission Line, and Duplexer manufacturers.
Cable Experts
Andrew Web Site
Times Microwave Cable
TCS Consultants, Calculations and Conversions
Decibel Products
Repeater Supply Index
Amateur Repeater Builders Page