The QSL card using United States Post Office double reply postcards is coming along kind of beautifully if I do say so myself. I've updated the template (I'll upload it to github soon) so it does a mail merge with an Excel spreadsheet. Using the double reply cards , I can simply print out my QSLs after a Parks On the Air activation . On the backside of the card, I can paste a picture of the night's operating conditions And! If the recipient doesn't have a QSL card, they want to send back, well, we've got that covered as well There was a small issue with the little label falling out of the folded over card, but a glue roller was the solution