the antenna on my 300CE cabrio is making funky noises when tis going up/down, I'm planning on getting a new mast, and taking apart the 'snail' to clean and lube, then reassemble. Hirschman OEM antenna masts are like $100 yeouch!... off brand ones (<cough>Uro</cough>) are like $12. Now, I don't need the cellular feature at all, so is there any reason the OEM one is superior to the Uro on something as simple as a mast?