[Elecraft] Slightly off topic directional coupler question

[Rich McCabe]

I have a question :)

I only ask it here because its the best place for all my technical questions. OK, enough sucking up.

I just built a new Elecraft directional coupler with the intent of using it for a station monitor. 

I have a Tektronix 475a that seems to work OK for what I play with. 

I want to get a smaller (physical size) digital scope to use with my K2 and this new coupler and use it for misc troubleshooting with HF gear.

How far can I safely drop from my current 200mhz scope and get by?

Thanks and 73,

Rich
kd0zv