I agree with markovr, a mast and rope at $30 is cheaper than the full unit, and you have the same amount of effort to replace the mast and rope as the full unit, so why not go for the cheaper option?
One tip -- you need to remove the left side kick panel and the ECU to get to the bolt holding the antenna power unit, since it's only accessible from the inside of the car.
Cheers,
DP