I can think of two ways to do this:
1. In the suppression formula for the page header put OnLastRecord (do NOT check the supress box!) The problem with this is that you may not get the page header if there's only one record from the main report on the last page.
2. Are you grouping your data at all? If so, try using a Group1 Header section instead of the Page Header. Change the group to turn on "Repeat Group Header on Each Page." If you have a header for that group that you don't want to repeat on every page, put it in a separate section then put this in the suppression formula for that section: InRepeatedGroupHeader (don't check the Suppress check-box!)
-Dell