Can you take abanner in the stadium

It also cannot block other people's View

Yes you can

Also it can not have any bad words on it. Not even Cubs Suck

Yes. As long as it doesnt not have any wood, metal. And it is recommended to be about the typical size of poster board. If it is a folded banner, about 5 feet.

There were a bunch of signs people were taking in. As long as it doesn't have any wooden or metal poles I think you'll be ok

I think so