Public radio numbers are not posted for the Wilmington market (possibly because no public radio stations in the market). However, in Philadelphia, 91FM is more than a full point ahead of either WRTI or WXPN in 12+AQH shares.
If public radio numbers were listed with commercial station numbers...
WHYY-FM would rank between Q102 and Ben.
Penn is just below a two share and a tenth point ahead of Temple in that big gap between PHI and The Hawk.
The U of D has a license but they use it for student radio.
And, of course, DelDot has an AM license but they use it for their roadwork loop.
I suspect the real reason is a general public indifference. Despite a few people on this board who keep saying that Delaware NEEDS local radio - especially local radio news - like Philly NEEDS a dance station, most people couldn't care less. People in the Wilmington market mostly listen to Philly radio (and, of course, watch Philly TV). And going by the Snooze-Urinal, "only one Wilmington radio station" or "Delaware's ONLY news station," not much interesting happens in Wilmington any way. Oh, yes, some obligatory crime. Maybe a release of toxic chemicals. Maybe a prison escape. Some bored meetings. And some do-gooders who want everybody to know how much good they are doing. If WHYY-FM throws in a decent Wilmington story or two each day, they mostly have covered everything worth covering. On the local stations, the rest is fill because they have to fill the time and justify their existance. You know, if DelDOT's WAMS did continous live real-time traffic and weather, hardly anybody would listen to the so-called radio news any more.