What kind of broadhead? I use a Smith's handheld carbide sharpener (like an Accusharp) for my slick trick blades, but some broadheads are more suited to different types of sharpeners.
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PSE Axe 6
61# 28"
Gold Tip Pro hunters 5575
Slick Trick 100s
Summit Viper SS
Scent Blocker Plus
Black Diamond XR 50 cal.
Hawken 54 cal.
All of the blades are removeable...you can definitely get away with something like what I use (accusharp style handheld carbide sharpener). They also make some of the block style sharpeners for 2/4 blade broadheads but I have no experience with them. You could also go to a Lansky system, but too me that's too much effort when the carbide sharpener gets the job done about as well.