I use a Sennheiser KME 300D cam mounted shotgun and it works a treat in most situations. Radio mic's are a good idea but in my experience getting pouches into dresses, good luck. Make sure you attend the rehearsals and you will find out where to place any mic's but please keep in mind the day is about the bride and groom not you. Don't get a reputation for being obtrusive...you won't get much work!!