No need for omni-directional. Most of your stations are to your South. The Miami stations are 86 miles out at 180 degrees magnetic. You also have stations as near as 6.5 miles in the same general direction. These near by stations would overload an amplifier, so you need to do it with an antenna only, and due to the distanct to Miami, I would install a Winegard HD 7698P antenna, aimed to 180 degrees magnetic.
Mount at 25 feet. If you are hooking up multipul sets use a splitter with enough ports to supply all of your sets. If more than three sets and or long runs of coax are being used, you should install a distribution amplifier. Lots of lightning in Fla. so be sure to install a ground block in line with your coax and hook it up to your electrical service ground.
All of these devices are available at
www.solidsignals.com.