I hope that this detailed article increases interest in ultralight radio listening in the Spanish speaking world, Jorge.

For further reference, you might also mention the collection of Ultralight articles from IRCA's DX Monitor that are found in the IRCA Reprints.  Go to ircaonline.org and press the Free Reprints button, then go to the Ultralight section from the index.   There are 26 articles in that section at the moment.

(and, of course, many other articles also)

best wishes,

Nick