Passport and classic signal

Does anyone by any chance know if the passport and classic have a different antenna or something? I've had my classic with t mobile for a month and the service is awesome and crazy fast but now that I also have a passport and I'm using it on a daily basis I see that I have way less signal on my passport. Is there something that I can do or should of done when I first got my passport to maybe boost my signal or is it just something that can't be fixed? Because even though I love my passport I'll gladly return it and use my classic as a daily driver.

Posted via CB10