How can I create a banner space for an iAD in unity iOS Basic?

I am aware that I can create a banner for an iAd through Xcode, however, I would like some advice on how I can code it in Unity, so that I am able to keep my scripting all in one program.

I would recommend purchasing the Prime31 iAd plugin. Here's the link:

http://www.prime31.com/unity/