Quick google search explained that you can either hang it overboard, or put it on the inside of your hull, and SUPPOSEDLY it sends out electronic signals that mimic injured baitfish.
Flowers Boat Works 46 hull #1, Flowers Boat Works 36 hull #1, Wayne Beal 28 Hull #1, Repco 30 1968,
I don't know if the Tuna Magnet works but my Mako Magnet works great. Last trip out we had 6 makos and no blue dogs using the thing. I can't be positive that the thing works but I feel better using it.
I have the chick magnet that works pretty good his name is Odin my pittbull . All the women say he's so beautiful and I tell them that the dog is pretty cute too !!!!