This is from Bruce, VE5BNC in Saskatoon. He's part of the SABRE high
altitude balloon group.  They will be flying a VHF voice repeater on a
balloon next week, on Saturday July 23.  

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SABRE-31

Our next flight is planned Saturday July 23, at 08:00 (1400 UTC). We’re
flying a voice repeater that will allow hams as far as 400-600 km from
the balloon to talk to each other. We’re using an older balloon donated
to SABRE by Larry VE5LWW so we’re not sure if we’ll hit our typical
target of 100,000 feet or not. Any ham is welcome to be part of the
flight. The repeater will be on 147.540 simplex. It’s a simplex, store
and repeat repeater repeating up to 20 seconds for each transmission.

Thanks,
Bruce - VE5BNC