Can someone please refesh my memory.You make a shorted 1/4 wave for 20 meters and it blocks what?I only have to do this once a year for FD so I tend to forget!!??We are planning on running 20M,40M and 75/80M plus 6M.20 will switch to 80 when the sun goes down.40 will stay on all the time unless 6 opens up.Thanks Gregg K9KL