14". have them on all my mustangs and lightning. just looks better IMO.
How did you hook up your iPod to the Mach 460?
I cut mine with a dremel to roof height and then superglued the little ball back on.
There is actually a write up some where but go to http://www.peripheralelectronics.com/ and search for the one that fits with our mustangs. They say will not work with the mach 460 becasue of the built in 6 disc but it just replaces one of the discs. I could give you a lot more information but I am not at home.
When i get home i will search for the write up and its around $190 i think. And you can also control the ipod throug the head unit itself. so thats why i chose to do it instead of a whole nother head unit.
Stock antenna cut to roof height looks best in my opinion.