Instructions
Buy a display case. There are many display cases just for baseball pennants. A couple of sites are listed in the Resource section where you can buy them. You can always find them in stores too.
Build your own case. Since you may have a very distinct idea in mind of how to display your baseball pennant collection, you may want to design your own case. This way you know you will have the room to put all your baseball pennants into the case and not have to worry about buying another one later.
Select a spot to display your baseball pennant collection in your home. You may have a game room that will be ideal for this purpose, but if not you can make room in your bedroom--especially if you are living with your parents. A family room is another good place for you to display your baseball pennant collection.
Show off your collection. You are obviously proud of your baseball pennant collection so be sure you let people see it. Whether you have had to display it in an obscure area of your home or bedroom make sure people know you have it. Even if you have taken the time to set it up and have had to put it in a closet until you get your own place, you can always bring out your baseball pennant collection for it to be admired by others.