The Chameleon RFI Choke is made of five (5) sleeve beads featuring #31 Ferrite Mix which is the best for this purpose. The #31 Ferrite Mix Core covers 1 MHz to 300MHz.
They can be installed either at the antenna feed point or right behind the antenna tuner.
The choke is composed of the following:
12″ of Coax Cable
Power Limit 300W SSB
Everything is protected by about 10″ of black 3:1 Polyolefin Heat Shrink for maximum protection.