Not sure what antenna you have but some antennas don't move they are omni-directional antennas. Can you take a picture of the antenna and where it contacts the roof. Also the inside is there a crank up on that there is a round ring and you have to pull down a bit n the ring to unlock then turn to make antenna move. If you have the Omni directional do you have the amplifier on, switch is on the plate here your tv cable plugs in near the tv. My problem is the cable on the roof always seems to corrode so I started putting Dielectric Grease on the roof cable ends. All in all take some pics not being there it will help. Your going to have to get up over the roof to get them.
Think about things before you do them make life easier not harder.