I spent some time creating new 3D CAD drawings of the antennas found in the 9500ci and STi-R. Both antennas are identical. The 3D CAD drawings of the actual antenna dimensions have been incorporated into a revised PDF document which you can download, print, and then cut out in order to assemble a 3D paper version of either the 9500ci or STi-R antenna.
The obvious purpose of the 3D paper antenna model is to allow you to check all possible installation positions for the remote antenna included with either the 9500ci or the STi-R radar detectors. The other purpose of the 3D model is to show you the actual antenna positions as well as the internal flares of the radar horns for the X band and the K-Ka band radar antennas.
Here is a side view of the K-Ka band radar antenna used within the 9500ci and STi-R. The X band antenna is very similar:
The K-Ka radar antenna features a predominately downward flare. Note the shaded antenna regions labeled as the "antenna neck" and the "antenna throat". Maximum antenna sensitivity will be rather close to the angle shown in the antenna neck since this angle is 1/2 of the angle between the antenna's top and bottom walls. Why is this so? Because radar entering the antenna at this angle will encounter the antenna's top and bottom walls at what appears (to the incoming radar wavefront) to be identical yet opposite top and bottom wall angles. This is important since it prevents phase shift of the incoming radar wave (causing a loss of sensitivity) as it enters the throat of the antenna and then proceeds onward towards the antenna's neck. So, this magic angle of 8 degrees relative to horizontal is something to keep in mind when installing a 9500ci or STi-R remote antenna.
Here is a CAD isometric cutaway view of the antennas within either a 9500ci or STi-R remote antenna. Note that both antennas feature low noise amplifiers (LNAs) which strongly amplify incoming radar signals and which also provide very good reverse isolation to prevent microwave radiation leakage from further within the two antennas:
Finally, following is both a link to and a screen capture of the new PDF document which you can print out, cut out, fold, and then tape together to create a 3D model of the 9500ci/STi-R remote antenna assembly:
Printable 3D PDF Template of the 9500ci and STi-R Remote Antenna Module
Following is a photo of the older cut out and assembled 3D PDF template. The new template, as shown above, has additional features to indicate the optimal tilt angle for either the X band or the K-Ka band internal antennas. So, depending on your remote 9500ci or STi-R antenna's installation height and mounting constraints, you should be able to quickly figure out if you need to angle the antenna either up or down for optimal performance, or whether you need to flip the antenna upside down and then appropriately angle the antenna for optimal performance:
I hope this information allows you to both optimally install and adjust the angle of either your 9500ci or STi-R remote antenna. Please feel free to fire away with any questions.