Is it allowable to mount a GPS antenna on top of a radar dome?
Sue & Larry respond:
At first we thought it would be fine to mount your GPS antenna on top of a radome, but then we became concerned that there might be stray magnetic fields or other electronic disturbances emanating from the radome that would affect the GPS signal. We decided to call Raymarine and get the answer straight from a company that produces both radar units as well as GPS.
The technical answer we got is yes, you can mount a GPS antenna directly on top of a radome. The key to GPS antenna placement near a working radar is to make sure that it is either above or below the actual beamed signal so that there will be no interference from the radar itself. The major concern about mounting a GPS antenna directly onto your radome is that it might somehow allow moisture to enter the gasketed radome through the mounting fasteners. A safer solution would be to fashion an independent mounting bracket that places the antenna in your desired location, but does not penetrate the cover of the radome.