Sorry - no piccies :-(
What I've seen was similar to the Ventura system suggested by Nigel but about twice the height so the bike frame could be rigidly strapped to it. I used to have a Ventura system and it was very good but I would think a little on the low side.
Basically you need an upside down U/V shapewith a 90 degree bend so that you can mount it to the bike on the frame somewhere near the saddle. There are usually some holes/fixing points for something else that you could use.
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