I chose the combination of the Force 12 C49XR Yagis for my 10-20 stack.
The reputation of performance and excellence with the Force 12 antennas is well known. Tom Schiller, N6BT, spent considerable time creating and designing each Yagi to perform. The specs on these two antennas made them ideal for my antenna farm.
The C49XR was designed to be the world's biggest tribander. It has a 49 ft boom with 4 active elements for 20 meters spaced in a OWA pattern, 7 elements for 15 meters and 14 elements for 10 meters. It can be fed with a single feedline or with three separate feedlines.
The C31XR is the younger brother of the C49XR. It has a 31 ft boom with 3 active elements on 20 meters, 4 active elements on 15 meters and 7 elements on 10 meters. It can be fed with a single feedline or with three separate feedlines.
I chose this box to phase my yagis after considerable research. It is the best value in the market in my opinion. The support by Jay and Bob at Array Solutions is amazing - far better than most ham organizations provide.