On Sun, 31 Jul 2011 13:30:17 -0700, ehoops rearranged some electrons to
say:

I'm getting back into radio after a 20 year absence. Back then, I had a
QRP rig and a novice license; didn't worry too much about my antenna
unless the SWR meter went past 2.5. What I did not have was an antenna
tuner.

Now that I'm older and wiser, I realize an antenna tuner is probably a
necessary thing to have. I'm putting up an 18' Hy-gain 5 band vertical
antenna, leading to a Yaesu FT840 @ 100 watts. The matching ATT is not
available, unless I'm willing to bid on E-bay for a hundred more than it
cost new. (Believe me, I've tried this.) But I don't know what I
should use. I know some tuners are designed for a specific rig.

Does anyone know what I should get? I'd really just like to turn on the
radio, move to a frequency, turn on the ATT, and tap away. Help!

I agree with Sal, LDG makes a good product. I have a Z11Pro2. It
doesn't require any interface with the radio, it measures the incoming RF
and antenna side SWR to know when to tune. It also latches the settings,
so it stays set up even if I take power off of it (which I do when I'm
not trying to tune it).