Green = 4 mile radius (very good coverage)
Blue = 8 mile radius (mostly good coverage)
Coverage will vary with tropospheric conditions particularly during the summer. Sometimes it will be very good in Gurnee, Waukegan, Kenosha and Grayslake and some days it will be marginal into Lake Villa and close towns. Location of a portable radio inside your house may make a difference in marginal coverage areas. Dipoles work well and roof antennas are, of course, the best. Consider using a TV antenna for your FM reception if you're in a marginal area, even if you need to hide it in your attic.