Q-Why do cell antennas need to be installed vertically or horizontally? Does it make a difference in performance if an antenna is not installed properly?

A-There are three types of polarization for all transmitted RF energy (cell signals) - vertical, horizontal and circular.

The type of polarization is dictated by the transmitting antenna; virtually all cell towers use vertical dipoles. This is why we specify that all Digital Antenna omni-directional antennas must be vertically positioned.

All cellular signals are vertically polarized. However, over distance they do rotate in space, at least theoretically.

The cell tower sends the cell signal in a vertical pattern. Because the actual path of the signal from the cell tower to the outside antenna can vary, including multiple bounces and reflections between the tower and the antenna, it would be impossible to know the exact relation of the polarization being received.

An antenna should be installed with the proper polarization according to the instructions. In general, the signal should improve with proper polarization since microwave (cell) signals are very sensitive to it.

Q-How do I know which size trim tabs to purchase for my boat?

A-Many factors affect the choice of properly sized trim tabs, and the ultimate responsibility for selection is up to the boat owner. These sizing recommendations are based on average performance. Your choice may vary based on power, engine configuration, weight distribution, type of boat, and use. When making a choice between trim tab sizes, remember that the largest trim tabs that will comfortably fit on the transom will be the most efficient. For complete information see article on trim tab sizing.