To help you determine what size your banner should be, here's a guide to give you an idea on what proportion would best accomodate the wording that you would like to have printed on the banner.
common 2 foot sizes:
common 3 foot sizes:
common 4 foot sizes:
You aren't limited to these sizes, so if you need a specific size that has to fit into a alloted space, need a larger size banner, or just need a different proportion than shown here, we can have it made to YOUR SPECS!