The club competition rule (XII) mentions a 275 Km radius circle. How is the center of the circle determined?
The club may choose any point as the center of the circle. The only requirement is that all entries for the club be from within the area of the circle. Once the center of the circle has been selected, it must remain the same for both modes of the contest for that year. The exception to this is operations by club members on DXpeditions to other countries organized specifically for the contest. I.e., one or more members travelled to the DX location to operate around and during the contest. Former club members who have moved their permanent residence outside the club area do not count as DXpeditions.