Easiest way to use different header & footer?

We’ve got a few marketing campaigns which will be launched shortly, and the consultants suggested very targeted landing pages … a single call-to-action funnel without the distraction of the typical site navigation. Focused.

Do we need to create a separate WP install on a sub-domain or something, or is there an easy/practical way to have a separate set of header/footer files for a given collection of pages.