In my experience (and Ive had 4 of them)
If it's bringing in a signal in the down position I don't mess with it!
The one on The Argosy is stuck 3rd way up but not any higher then the A/C
shroud and brings in a good signal!
Ive messed with them on my 79 and 74 and they both then leaked in a long rain.
I tore the one off the 79 and put in it's place a cool looking crank up
Satellite Dish!
Will never do that again!......The one I have now attached to a milk and
crate works much better!
AlanT
Phx AZ
78 Arg30
93 Dodge Diesel