[ron skeen]

Stave, you are correct, it is the antenna alarm which I never use.  As to sound, it is constant and sounds like a turn signal and it shuts off when the ignition is turned off.  I raised and lowered the antenna, no change.  Did it again but this time I moved it around, lowered it and the alarm went off.  This is until I hit another rough road.  Tomorrow I will see if I can reset the antenna lower or disconnect the alarm, once I find it.  Thanks for hitting the nail on the head.

If you will go on top you might check the adjustment of the switch. I thing it is just a brake light switch with lever that is activating the alarm.