Our home has three large antennas in the attic, they all happen to face exactly in the correct direction of our primary tv market. I've connected to one of the antennas and get a great signal, picked up 48 digital channels. Why would someone have three large antennas in the attic. Should I connect them all together to get a stronger signal? If so, anything special to consider as I do so? I loaded photos on post #4.