I mounted my under the speedo cowling per the online instructions and have had no problems. If I wait long enough I can actually get reception in my garage and that's with the nose in. The cowling just pops off and you fish the antenna line through to the mygig. Do you have a two story home or in an apartment building that blocks the antenna's line of site? There may be something interfering with it's line of site being mounted above the head unit on that beam, may be the reason why the instructions say to mount above the speedo. Also is it the correct antenna for the mygig. I've read some of the non-oem units can cause problems. I got my unit from oemautopartsco
with the included antenna and mic.