Herb,
The approach which has always been used when I have been involved uses the output of /interface wireless scan 0, but it really requires two people.
1) person on tower preps the dish and does their best to aim it in the right direction. They report to ground (usually via a HT) that they are ready.
2) person on ground that is logged into radio, issues the scan command.
3) The ground person at this point is in control and should be doing almost all the talking. (which is good, because the person the tower needs both hands aiming the dish)
4) ground person reads the signal level, whether they see a connection or not, etc. They need todo this continually, because the person on the tower is completely operating on what they are being told. This means you keep swing in one direction until the ground person tells you to stop and go back the other direction.
5) remember that you will need to adjust horizontal and vertical multiple times to fine tune the signal.
6) also remember the scan sucks and will 'stop' updating when it looses the signal.
7) the tower person has to try and go as slow and steady as possible when adjusting.
If you are using a professional tower climber, get a set of FRS radios or something to send up with them. I'd be surprised if the pro's haven't done this general alignment before, but that is just a guess.
Kenny