I take my little 13" TV outside with me and connect it to the stb so I can hear the pitch of the signal strength and see the color of the bar. The cheap signal finders do just that, find a signal but they don't tell you what sat it is. Positioning a dish is a breeze if you have a compass, just set the azimuth, making sure your post is dead straight vertical, thing slowly swing the sat until you find a beep then fine tune it, peice of cake.
A buddy of mine moved and wanted help putting up his dishes and he thought I'd never find 61.5 at his new house. I had it tuned in within 5 minutes of mounting the mast.