ARRL rules require unlimited and medium class clubs to define their territory by a
rectangle or by a 175 mile radius circle around the club center.
If in doubt as to whether you are within our 175 mile radius, go to ARRL's Grid Distance Calculator on their contest club web site. Set the Measurement units to miles, ensure the button "Distance from reference grid" is checked and enter the reference grid as DM15dc, our club center location. In the box "List grid squares below", enter your six character grid square and press the "Calculate Distances" button. If you aren't sure of your six digit grid square, it can be found on QRZ.com on the Detail tab. Always use your six digit grid square in this exercise for maximum accuracy. Note that the CQ Contest rules have a 250 mile radius from the club center.