|  | 26 |  | 
          
            |  | 27 |  | 
          
            |  | 28 | The top of each Massive-MIMO mini-rack is populated with a horizontal array of 32 [attachment:APAMSJ-137.pdf antennas]. They are mounted on a rectangular plate with a 2 inch spaced grid pattern. See table below for antenna location to USRP mapping. | 
          
            |  | 29 |  | 
          
            |  | 30 | Example antenna configuration (top-down view) for node23-1 through node23-8: | 
          
            |  | 31 | ||||||||||||||||=''Back of Massive-MIMO mini-rack''=|| | 
          
            |  | 32 | ||23-1 RF A TX/RX||23-1 RF A RX2||23-1 RF B TX/RX||23-1 RF B RX2||23-2 RF A TX/RX||23-2 RF A RX2||23-2 RF B TX/RX||23-2 RF B RX2|| | 
          
            |  | 33 | ||23-3 RF A RX2||23-3 RF A TX/RX||23-3 RF B RX2||23-3 RF B TX/RX||23-4 RF A RX2||23-4 RF A TX/RX||23-4 RF B RX2||23-4 RF B TX/RX|| | 
          
            |  | 34 | ||23-5 RF A TX/RX||23-5 RF A RX2||23-5 RF B TX/RX||23-5 RF B RX2||23-6 RF A TX/RX||23-6 RF A RX2||23-6 RF B TX/RX||23-6 RF B RX2|| | 
          
            |  | 35 | ||23-7 RF A RX2||23-7 RF A TX/RX||23-7 RF B RX2||23-7 RF B TX/RX||23-8 RF A RX2||23-8 RF A TX/RX||23-8 RF B RX2||23-8 RF B TX/RX|| | 
          
            |  | 36 | ||||||||||||||||=''Front of Massive-MIMO mini-rack''=|| |