It's easy enough to understand how this happened. There is no contract involved for exclusive rights to broadcast high school games, and the two sports stations are under separate ownership (560 AM WEBC is owned by Town Square Media; 1490 AM KQDS by Red Rock Radio) . But there is still the valid point that you'd think the two stations would communicate and not broadcast the same games, because that is not only in the best interest of the audience, but also the stations.

Keep in mind that the intentions of both stations are good -- to serve the community by airing local games. It's also possible there is more ad money involved if local businesses are more inclined to have that sense of supporting youth sports by advertising during high school games instead of professional ones, but the cost of doing the broadcast probably eats most of that up. 

So much radio is not local that it's tough to hear complaints of there being too much local. But, as stated above, you are right, all they have to do is talk to each other. Two broadcasts of the same game isn't better than one.

I assume the game in reference here was Denfeld vs. Marshall. For what it's worth, the KQDS schedule indicates the Wild game was to be joined in progress after the high school game. I'm not sure how that timed out in terms of allowing anyone to hear much of the end of the game.