I've been driving with no antenna screwed into the base since last Friday and have noticed zero difference. I drive about 100kms a day. I only listen to XM so it shouldn't matter for me but I tested FM and AM and it sounded perfect.If you end up getting one, I'd be interested to hear what you think of the reception. I'm thinking about getting a 2" Cravenspeed Stubby Jr, as a less expensive alternative to going with a Sharkfin.
I'm in Canada, so I'm also faced with paying a fair bit more and wouldn't mind a bit more feedback before I decide. (The Amazon reviews are a real mixed bag, but I figure they're from several different types of car, which would likely skew the results)
So adding a 2" stubby can't make things worse maybe a bit better. My parents are returning from FL in 6 weeks so I might order one in the US and have them bring it back for me. Or just pay the extra money and order directly to me haven't decided yet. I'll update things either way once I get it.