Several of our portable wattmeters, (43, 43P, 4314C, 4391A) do indeed operate up to 2.7GHz using elements from our standard element tables. Unfortunately, due to parts becoming obsolete from our suppliers, we can no longer make the high frequency elements. Most of them top out at 1.0GHz, and we do have elements from Table 3 that top out at 1.26GHz.
Don't despair as we do have some other products that will cover higher frequencies without the need for elements. Click on the following link: https://birdrf.com/Products/Sensors/RF-Power-Sensors/RF-Power-Sensors.aspx