You can aim one at 263 and one at 19, but combining them is a problem.
If you use a splitter in reverse as a combiner, that usually doesn't work well because when the same signals from each antenna reach the combining point, they will interfere with each other if they are not in phase. You are welcome to try it, but you probably will not be happy with the results. When it doesn't work, some channels are missing.
You could have the 263 antenna connected to TV 1 and have the 19 antenna connected to TV 2.
You could have a splitter from each antenna and an A/B switch for each TV to select which antenna is needed. Each TV would need to be able to add a channel after scan or you would need to rescan after each change of direction.
You could connect one antenna to the TV antenna input, and connect the other antenna to a separate tuner with its output going to the aux input of the TV.
An Alternative to Rotators and Antenna Combiners
http://forum.tvfool.com/showthread.php?t=820