This thread seems to be going over some similar ground to Skywave's thread(s) a few months back on RF Voltmeters e.g.
http://www.vintage-radio.net/forum/s...d.php?t=131879.
A number of posts in that thread seemed to suggest that the simple J-FET buffer amps (pubslished in
numerous places and often using 2N3819 or MPF102) were often found to be very good attenuators! I think Skywave ended up designing a very good RF amp with a 2N4416 FET and a pair of BRF96's (?) that gave a useful gain that was flat over a very wide frequency range. Could be useful here I guess.
B