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Well the OEM GPS antenna is in the shark fin on the roof - if you don't have one of these then cutting a hole in the roof isn't really an option. You can buy a generic GPS antenna from eBay and as long as it has a FAKRA connector it will work.
I know people have had issues in the past with aftermarket antennas not working when mounted under the dash, as some E9x were fitted with a UV reflective layer in the windscreen (I know mine did) which can cause issues, it was assumed. I would run an extension wire and stick it on the rear parcel shelf behind the back seats. PM'd you.
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