I know what you saw, but you have to remember that beam is higher up in the atmosphere at that distance. It's rotation well aloft. It's easy to be tricked if you don't keep that in mind.
Tilt 1 is the lowest beam. Tilt 4 is the highest. Just sends out the beam at diff altitudes so you can see how it's performing in terms of vertical growth... if it's weaker aloft, its crap, if its intensifying aloft, usually means its strengthening