I ran into a problem with my hexbeam today. When I rotate it I am finding places where I think I am losing connection.  It is typically tens of degrees rotation before it comes back and I hear crunchies in my receiver.  So my best guess is there is a fault in my jumper between the 1/2" heliax going up the tower and the input of my choke balun.  I used a high grade coax; RG213 probably.  Is there another type cable that will take repeated movement?

Thanks!

Rory, K5CKS