This is our simplest and yet most popular model. 6 ferrites LFB095051-000 of www.lairdtech.com are strung together with 12 ferrites CST9.5/5.1/15-3S4 from www.ferroxcube.com to about 50cm RG142B / U Teflon®-Coax. The "total ferrite length" is around 30cm. The choke has an extremely wide bandwidth and an attentuation of about 1000 ohms in the range of 160m - 2m. It is shrink wrapped weatherproof and has PL259 connector (Teflon®insulation / gold pin) at the ends. A PL258 adapter (dual female / Teflon® / Gold) is included.
Here is a comparison of our choke baluns: Comparison Choke Baluns