Hey,didn't you have to remove the wipers?

Just messing with you. But,just to be accurate,that has to be done to remove the cowl cover. This is a good time to dig down and vacuum/blow out debris from your cowl cavities
All the AM radio trucks I've had came with solid masts. I think telescoping was an accessory. The ideal length for FM is 31" and that's why anything with AM/FM will have a solid mast 30-32"