I store my Stang at a storage yard. I replaced my broken antenna with a universal type that unscrews for storage. I bought a soft, cloth type from Kragens for about $150. It doesn't scratch the paint and is somewhat water resistant. You really don't want water proof if storing outside as moisture will build up under the cover, you want a cover that will breathe. I do have another plastic cover over the roof and windows as my cowl leaks and the side window seals aren't in good shape. I put two pieces of foam between the plastic and car cover to help water slide off roof and not build up. BTW, I live near California Mustang too.