I was wondering if you know if there exists a cheap alumina substrate that we can buy that has a probe-able 50ohm CPW line which we can cut open and add in some chip resistors to make an attenuator. The line impedance is not even critical as long as the line is short, since we are operating only up to 4GHz. One of the delay lines on our Calibration Substrate would suffice - but that's not something we want to go and mess with.
P.S., I think your radio projects are cool
![Smile :)](./images/smilies/icon_e_smile.gif)
Edit: Found some Hittite parts that fit the bill, we have to order 10 but it's not too expensive.