XERF is across the river from Del Rio, TX, and is now running less than 50 kw. IMER does programming that we would compare to NPR, with a focus in some markets on the many indigenous languages of Mexico.There are likely financial reasons for them not to get it, but the public broadcaster IMER owns XERF.
XERF is non-directional and on a full Mexican (former) 1-A clear channel. On the other hand XEWW proteccts the major Grupo Radio Centro AM in Mexico City and must be highly directional away from most populated parts of Mexico itself except for the NW portion of Baja California. It's best population coverage is from Ensenada up to the coastal areas of Los Angeles.
That is because it had to comply decades ago with the enhanced CANCON rules which severely restricted the music they could play... along with the rapid transition of audiences to FM in the 70's.In some ways, I could see a similar analogy to CKLW, as it serves Windsor and SW Ontario now.