This new PackTenna Mini Choke is smaller than the original PackTenna choke and can handle up to 100 watts. The in-line choke attenuates unwanted common mode current flowing down the outside of the coax shield. This is a common source of interference in the shack. The in-line choke is placed close to the antenna in cases where you don't want the coax to radiate. The choke can be place in the middle of the coax run or closer to the shack end of the coax if you are using the shield as part of your antenna's counter poise system as it often found in end-fed long wire antennas.