Well, my Diamond X300A reaches out there, but only if the radio is working. Intermittently, the IC-706MKIIG fails to transmit on 2m or 70cm. The power output meter bounces momentarily to full power then back down to about 20-30%. It looks like the sort of thing the rig will do into a bad load, but I can verify with two other rigs (Icom ID-51 and Kenwood TM-731A) that the antenna is good.

On a mods webpage, there is mention of a fix for a problem specifically with FM transmit that is very similar to what I am experiencing. The fix is basically reflowing the solder on an adjustable capacitor. The next time the symptom shows, I will try to remember to look at FM on HF to see if it happens there as well as SSB on 2m or 70cm.

My gut feeling has been that its something in the power amp to antenna connection chain. Once I have the box open, I will look at both.