Two questions about the PIPER CUB

Howdy folks,
I was browsing the web and came upon this odd photograph of the Piper
Cub strung on wires above the ground. Apparently it was used to launch
aircraft and catch them without landing/takeoff.

Here's the pictu
http://www.ww2incolor.com/gallery/us...ipercub_brodie

Anyone seen that before? Was it practical? Did they actuallly use it?

Secondly -- and this has nothing to do with the above question -- I am
interested in purchasing some land out in the country and would like to
be sure I can eventually fly a Cub or Super cub into "my backyard".
Anyone know how many acres are needed for a decent grass landing strip?
Please no answers like "2 acres can be attempted/CIA bush style" . I
want safety in mind! I have some options to get maybe around 25 acres,
but not sure if that's enough.

Thanks for your time folks. I look forward to your response.