Depending on your design, you can have one wlc to manage a site. Now... also this depends on how may ap's you have since certain wlc's only support certain number of ap's. H-REAP can be used over a WAN as long as you meet the recommended specifications.
WLC's
2106 = 6 ap's
4402-12 = 12 ap's
4402-25 = 25 ap's
4402-50 = 50 ap's
4404-100 = 100 ap's
WiSM's = 300 ap's
-Scott
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