Many people recommend bike chain lube by White Lightening. It stays on the shaft very well. Available for cheap at Walmart. If the antenna is bent, replace the antenna. I got an URO antenna off of Amazon for about $15 ($90 for the Hirschmann) and the quality is excellent. Only URO part I would put on a car.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.