I have an 5 elements yagi for 6 meters and I would like to build an RF choke made from turns of RG8/U coax cable with 6 inch (15.3 cm) diameter, but I don't know how many turns I must used to do the RF choke to install on this yagi for 6 meters. I'll be very appreciate for your answer. 73's DX's Jo„o, PY2NQ