1. Animation: Rotating the unused top Yagi in a 3-Yagi stack
Instructions:
To view the animation, click on the pull-down menu Slide Show/View Show or press F5. The
animation will repeat until you press Escape.
To examine the material more closely, do not enter the animation. Use the Page Down and Page
Up keys to move between the slides.
Note these pattern variations are not quite symmetrical because K4JA’s antennas rotate on ring-
rotators around the side of the tower. When an antenna points in the opposite direction, for
example, its boom will be on the opposite side of the tower from the other booms.

2. Top Yagi azimuth
twist = 0°
3-Yagi stack gain (dBi)
Top unused
2-Yagi stack gain (dBi)

3. Top Yagi azimuth
twist = 0°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

4. Top Yagi azimuth
twist = -10°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

5. Top Yagi azimuth
twist = -20°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

6. Top Yagi azimuth
twist = -30°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

7. Top Yagi azimuth
twist = -40°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

8. Top Yagi azimuth
twist = -50°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

9. Top Yagi azimuth
twist = -60°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

10. Top Yagi azimuth
twist = -70°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

11. Top Yagi azimuth
twist = -80°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

12. Top Yagi azimuth
twist = -90°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

13. Top Yagi azimuth
twist = -100°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

14. Top Yagi azimuth
twist = -110°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

15. Top Yagi azimuth
twist = -120°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

16. Top Yagi azimuth
twist = -130°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

17. Top Yagi azimuth
twist = -140°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

18. Top Yagi azimuth
twist = -150°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

19. Top Yagi azimuth
twist = -160°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

20. Top Yagi azimuth
twist = -170°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)

21. Top Yagi azimuth
twist = -180°
3-Yagi stack gain (dBi)
Top unused
Gain difference from
2-Yagi stack (dB)
(i.e., top Yagi missing)