Dave, G0DJA and I had a go with WSPR on 23cm today.

Dave transmitted today & I listened.

We only tried a few transmit cycles. I received good strong traces with little drift and with rx well time-synched.

On 4m, Brian's signals from Liverpool way often show doppler reflections & distortion, but decodes are reliable.

On 23cm there were similar doppler effects on Daves' signals with one trace showing significant reflections + or - 80Hz either side of the transmission. The signal also looked to be wider bandwidth, but this might be a side effect of Daves strong local signal.

None of the packets decoded.