Position for 2SA13X 2SA13 vert. tube +45/-45 Vert from refl. gain gain (mm) (dBi) (dBi) 3300 15.3227 15.3718 3350 15.6410 15.8559 3400 15.9155 16.1597 3450 16.1350 16.3339 3500 16.2898 16.4193 3550 16.3531 16.4330 3600 16.3131 16.3796 3650 16.1698 16.2552 3700 15.9379 16.0480 3750 15.6359 15.7369 3800 15.2856 15.3012 3850 14.9159 14.7531 3900 14.5500 14.1713 3950 14.2510 13.7461 4000 14.0936 13.6908 4050 14.3394 13.8951 no tube 16.6184 16.6163