When it comes to the problems of 104.1, let's look at the numbers:
(1) 104.1 never got much above a 1 share doing pop en espanol.
(2) BMP's Digital format most recently got almost a 10 share in Laredo. It gets about a 5 in the Valley. It's been as low as a 1.2 and as high as a 2.1 in Austin over the last year. The Austin ratings aren't stellar, but they're roughly double what Digital got in San Antonio.
(3) KGSX signs on with a similar, if not identical, format, and the two stations added together get a 4.5 in KGSX's first book. Since then, the two stations leveled off to between a 3 and 3.5, which is roughly three times the largest audience KRIO-FM ever had.
So, that means one of the following had to have happened when KGSX signed on:
(1) A seismic population shift among the Hispanic demographic in San Antonio.
(2) Digital's format was so bad, even pop fans wouldn't listen to it.
(3) KGSX had a signal that reached the portion of the audience that was clamoring for it while KRIO-FM's didn't.
Breaking each of these possibilities down:
(1) A seismic population shift timed exactly when KGSX signed on seems very unlikely. A shift into San Antonio as bad or worse than the one Hurricane Katrina caused out of New Orleans would have had to have happened. It doesn't, to me anyway, look like that happened.
(2) The Digital format may or may not be good, but it does fine in Laredo and the Valley and does much better in Austin than it does in San Antonio. It even beat its competitor, Univision's KHZS, 12+ in the Spring '09 Austin survey. Based on these numbers, Digital should have done far better in San Antonio.
(3) I don't see how it could be anything other than signal. The numbers just don't seem to support anything else. If KRIO-FM had a signal that covered all of San Antonio to its target audience's satisfaction (those are the key words), it should have done at least twice as well as it did prior to the launch of 95X.