@zoltan, @Syed, @kenbarbi, @ac8dg, @tylerhoot
Following is a picture of the results of the one gallon can shield. This proved to be a bit unwieldy once mounted, and did not perform really well. The SNR came down 2 to 3, but due to the weight, it moves too much with the wind. It does work, but not nearly as well as other articles we have tried. I think the diameter is maxed out and its effectiveness really is minimal, and it is not practical. Just had to try it out and see where the SNR went with the increased size. It has been rain/snow here (sticky, but melting within an hour) all day. The trapezoidal horn made of 1/4" grid did not perform well with snow on it, and fell back to the -14 to -13.5 range until the snow melted off.