You can with the MLB.com At Bat 2011 app. When you purchase it, of comes with a free trial of MLB.tv. You can watch any MLB game in the league. I forget the price of the TV portion, but I know it's a little pricey.
That At Bat app includes streaming radio feeds from both teams home stations. It's about a 30 second delay from the regular broadcast, but for me it comes in much clearer than the AM station.
First of all, it is illegal. They are broadcasting copyrighted material without permission. Second, it's a one person run site somewhere in Europe. And no fool should give credit card information to such a shady entity.
I am not sure if you can but just be sure not to sign up to any unknown websites, just to be safe and NEVER download something you cannot 100% trust oof the web, it could ruin your iPhone. Hope this helps. P.s. I am running a YouTube series where i review the best new applications on the app store every wednesday. I just thought you might be interested. Here is the link. [ame=http://www.youtube.com/watch?v=NNkYeayUqNM]YouTube - ‪Best Free Apps For iPhone - 25 May 2011‬‏[/ame]