I just installed a magnetic based antenna on my galvanized tin porch roof. Will the metal roof act as a ground for the antenna? I am unable to attach a ground block to the antenna cable, because the end is fed through a window and connected to another cable, and the connection is lying flat on top of my air conditioner base. Thanks.
I take it that you are talking about a cellular reception antenna. if so, then yes, depending on the specific make of antenna, the design is to ground through the metal to enhance the reception.
- The metal acts as a ground-plane , which acts as a secondary antenna, using this technique should vastly improve performance.
- The larger the metal surface, the better the performance
- The device will work fine with no metal surface, however you should notice a performance degradation on a non-metal surface
It is just like the antennas they have for both phones and CB's they need to have the proper vswr, or correct length of cable and terminations. A galvanized roof would be fine as a ground plane just like a car or truck. The issue with a few folks in low areas is a taller or full wavelength attena would provide a better signal. Boosters may also help but my experience says a full length antenna is the best + a very tall pole, tree or mountain , other than that we would need more info.