This set of views will give you the opportunity to see the advantages of antenna stacking.  In order to keep the patterns clean, I have chosen to view only two of the antennas.  My C-51XR at 102' is basically a C-31XR (14 elements on 20, 15, & 10) and an EF-240 (2 elements on 40), so for my design I am using two C-31XR antennas to minimize the confusion.  For those of you already thinking about a potential phasing problem, yes there is, and I will address it in another set of views.

The set of views include:

• Single C-31XR @ 102'
• Stacked C-31XR's @ 102' & 62'
• Stacked C-31XR's @ 102' & 62' pointed at 90°

Here are the views of a single C-31XR at 102':

• Figure 1 (Single C-31XR)

 
 

• Figure 2 (Single C-31XR Azimuth Pattern)
• Note the great F/B

 
 

• Figure 3 (Single C-31XR Elevation Pattern)
• Note the 3 Large Lobes
• MAX  Gain at 13.67 dBi

Here are the views of a stacked pair of C-31XR antennas:

• Figure 4 (Stacked C-31XR Antennas)

 
 

• Figure 5 (Stacked C-31XR Azimuth Pattern)
• Note the Larger F/B

 

• Figure 6 (Stacked C-31XR Elevation Pattern)
• Note Only 1 Large Lobe 
• MAX Gain at 16.33 dBi (+3 dB)

Here are the views of a stacked pair of C-31XR antennas at 90°:

• Figure 7 (Stacked C-31XR Antennas at 90°)

 
 

• Figure 8 (Stacked C-31XR at 90° Azimuth Pattern)
• Note the Two Main Azimuth Lobes

 

• Figure 8 (Stacked C-31XR at 90° Azimuth Pattern)
• Note This Elevation Pattern is One Axis

 

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