Stacking Data (curiously missing from the manual I have):
=============

Array of 2 or 4 antennas
(optimized stacking distance, from center to
center of elements, for minimal side lobe
radiation)
- E-plane - Electrical distance .. : 3.55 lambda
- E-plane - Practical distance ... : 0.82 metres
- H-plane - Electrical distance .. : 3.55 lambda
- H-plane - Practical distance ... : 0.82 metres

copied from the Tonna web site on 20070801