You COULD use two different UHF-VHF-Hi antennas, but it becomes a real problem when you are using more than one TV set with that arrangement: there isn't any way that I know of to join two broadband antennas together and make them work reliably using multiple TV sets.. Chances are that your current antenna may be inadaquate in it's current state. If you are splitting the signal to two TV sets, that may be enough to cause the loss of some stations. A preamplifier may help you in that instance. If you have your antenna insalled in youtr attic, that may also suppress enough signal to cause the loss of channels. If your antenna is older that 5 years, I suggest that you replace it with a new antenna, preamplifier and rotator. The new line of Winehard UHF-VHF-high-band antennas are smaller than the older all-band antennas, and should serve you well. I would suggest a Winegard HD-7696p with a Winegard HDP-269 preamplifier and a new rotator like a Channel Master 9521a mounted on your roof. Mount the preamplifier as close to the antenna as you can, and mount the power supply indoors BEFORE the signal splitter. The only channel with which you may have a problem is WTSP, channel 10 from Tampa, as it's quite weak in your area.
http://www.winegard.comhttp://www.channelmaster.comhttp://www.pctinternational.com/channel ... lation.pdf