FYI, as shown you've got a +/-1.2V or so clamp, which isn't a very wide range. Also, the >= 1M input impedance into the ~20pF B-E capacitance forces a maximum bandwidth of 8kHz. You certainly won't need to spend all that money on a 120MHz opamp! But I'm not sure that this would be all that practical for a frequency counter.
To get 120MHz BW into 20pF, you need a "speed-up" cap, of the same value as the clamp, divided by the attenuation ratio. Unfortunately because your attenuation ratio is 1 (i.e., it's not dividing anything), there's no room for a "speed-up" cap in it (or, pedantically speaking, your only solution to the equation requires a negative capacitor -- not an outright impossibility, but hardly a practical one).
You probably need a capacitor in parallel with R209 for stability, and with R206 to maintain bandwidth, for precisely the same reasons but working against U205's input capacitance (2-5pF plus strays) this time.
If you need a wide range, high bandwidth, very high impedance, very low capacitance input circuit, consider the bootstrapped JFET follower circuit that oscilloscopes typically use. You will need to sacrifice gain for bandwidth, using speed-up caps on attenuators, to compensate for their resistance and load capacitance. You can also use the opportunity to bootstrap the clamp/ESD diodes, so they have less effect on the signal.
Tim