Would removing the radio antenna and rear wiper on the Prius improve its aerodynamics at say 75mph? Or would it have so negligible an effect that it really wouldn't matter?

I ask simply because I was discussing the somewhat silly shape of the Prius that compromises looks for aerodynamics, and it occurred to me the antenna and rear wiper may have been after thoughts given the rest of the design.

Does blocking off the front grill in cold weather improve aerodynamics? We don't really get cold weather here, but I'm curious.

Prius 2006, bought September 14: