I modeled a T vertical on EZNEC. My target was to get a design with zero reactance at the feed point. The vertical distance was per W1TSP's criteria. With 59 feet of vertical, two horizontal wires of 64 feet each and eight 60 foot radials. I got a feed impedance of 18.19 + J 0.4599 ohms at 1.83 mHz. The take off angle is 26 degrees. 73, Tom, W1TO