The C31XR-JK (Tribander) has been re-designed, optimized & Improved from the very popular C31XR Force 12 Tribander of all times for contesters and Dx'ers.

Here are the important changes/features from the classic design ....

1. The Boom has been shortened by a foot to make it a 30Ft boom yagi

2. The feed point for 20M, 15M & 10M are connected using a transmission line, the same way as the JK-MidTri & JK-BigTri.

3. The mast mount position is right at the center of the antenna at 180" with a gap of 25" on either side for a total gap of 50", which enables unhindered mounting on ring-rotors or side-mounting on towers.

4. The total number of elements on 10M has been reduced by 1 (one)  element while optimizing gain and swr.

5. The overall gain and swr on all bands is consistent & provides excellent performance.