This is a big one!
WGN-720 Chicago will be off the air between 2 and 5am Central time next Saturday, March 10th. (that's coming out of Friday night)
What's more, while it's not 100% confirmed, it is VERY probable both WSCR-670 and WBBM-780 will also be off the air during this period.
DXers are working feverishly to arrange special test broadcasts from stations normally blocked by these three Chicago powerhouses. A test has already been arranged with KOTZ-720 Kotzebue, Alaska.
Block out some time for this one, This is an opportunity that's not likely to be repeated...