In the past, I have let the antenna all the way out, then wiped with a WD-40 dampened cloth, then retracted the antenna. Repeat until it works properly.

98 Silver Frost SVT 97 BMW 540I Sport, six speed "Blue is for sky, black is for soil, and white is for simplicity, purity and hope for the future" "A coveted car should never stunt your life, but should make it more rich and interesting."