I'd start with one antenna... It gives you the capability of testing reception in odd directions by simply turning it manually. If the test proves you have a usable signal from a particular station that you are interested in, you can then decide if a second antenna is justified.
WHAG looks like it would need a DB8E or 91XG dedicated to it. If That proves to be true, I'd suggest using an axillary tuner rather than attempting to combine the two antennas which would no doubt interfere with one another if you used a reversed splitter to combine them.
http://forum.tvfool.com/showthread.php?t=2882