Just for completeness there is another GPS based alignment tool that does azimuth, tilt, roll and height (AGL). It is the Sunsight Instruments AntennAlign (AAT). It is an all inclusive unit with minimal external cables (1). It is not light in weight, but does all the functions and records the results in memory. Uses LASER rangefinder for measuring height. It can be pre-programmed in the office with target values for az, tilt, roll, and height for each antenna/site (many records are allowed). On the tower you select the target profile for measurement and save the results in memory for reporting later (via PDF, Excel, csvm etc.). Can be remotely operated from ground via web browser and standard 802.11 http://www.sunsight.com