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CC-ANTENNA-DK2: Board 6 via dimension

Part Number: CC-ANTENNA-DK2

Hello There

 So I'm trying my hand in deigning a 915 MHz helical antenna. I am using board 6 from the CC-ANTENNA-DK2 as the reference for it. I used the Gerber output to get the dimensions of the traces and clearances but unfortunately I am not able to get the sizing of the via (the drill and the pad size). I also referred to design note DN038 (part of the cc-antenna-dk1) which had slightly different dimensions on it and the via diameter was mentioned as 0.38mm (is this the drill size or the pad size?) with a board thickness of 0.8mm 

 I would assume the via dimensions are critical in determining the antennas operating frequency. I will be making my antenna a bit longer so I can adjust after fab. Could anyone at TI help me with the via dimensions which connects the helical part of the layer 1 to layer 4? Maybe the via dimensions are not that critical but I wanted to make sure :)