[NonEUCitizen]

1. Others estimate higher max frequency. This one's on the high side of estimates:

http://dangerousprototypes.com/2011/12/05/breadboard-limitat... [might have to ask EE friends about transmission line termination at those frequencies]

2. See also this video (and comments on video) where they measure:

https://www.youtube.com/watch?v=6GIscUsnlM0