My RT examiner was kind enough to call from my last frequency telling me that I was approaching the limits of his coverage - a nice way of reminding me to "leave" his frequency and call the next!
The Mayday was indeed from another aircraft that couldn't be heard from the ground.
All this pattern work was quite interesting for a balloon pilot!
Ripline
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I don't think that the sky *is* the limit, you know. It's more likely to be the ground.