Jerry, I have a similar configuration only not as tall. I have a 40' universal aluminum tower with a 3EL Steppir on top with ungrounded elements and a 20' vertical extension above the beam. I shunt feed it with a 35' arm of 1/2" copper pipe about a foot off the tower and an omega match. I can resonate it on 80 and 160. I use it mainly on 80 here and can tune it across the full 75/80 M band with one of the old heathkit motorized capacitors. It works great on 80 and less well on 160. My Inverted L seems to do better on 160 at this location. I have not tried to ground the steppir elements here.
Before we moved, I had the same tower with a Mosley PRO67C3 on top with the same shunt feed setup. At that location (only about 1 mile away) it worked great on both 80 and 160. I think the smaller top load of the Steppir makes a difference on 160. I have 30+ radials here of widely varying lengths. Dick, K4IQJ... ----- Original Message ----- From: "Jerry Keller (K3BZ)" <[email protected]> To: <> Sent: Sunday, April 03, 2011 11:29 AM Subject: Topband: Tower Shunt Feed >I want to try a shunt feed on my 60' aluminum freestanding tower topped >with > a 4 element SteppIR. The tower is a Heights and it tilts over on a 4' high > top-hinged base. I've come up with the following specs I dug out of K1ZM's > book "DXing on the Edge": ..... . _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
