Just in case you want an actual translation, here's one I did. No mention of confirmation of reception though. (Date, time, etc.), but still pretty damn cool.
Dear Mr. Tom Quinn,
We have the pleasure of greeting you and thanking you for the trouble you've gone to, as well as the time you've spent listening to our station LRA 36 Arcangel San Gabriel.
From the "White Continent of Argentine Antarctica", we give you cordial greetings and thanks for your troubles (to write to us).
Signed
1st Sergeant Sergio Alejandro LUCERO (Technical operator in charge of LRA 36)
Lieutenant Colonel Fernando Gabriel ESTEVEZ (Director of LRA 36, Chief of Esperanza Base)