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 metrescopied from the Tonna web site on 20070801