In-line lightning arrestors are mounted on a low impedence ground between the antenna and the point where the cable enters the building. This is a commonly used configuration since there is often a good ground nearby to connect to. The lightning arrestors require no additional power or wiring except the ground lead.
If the cable between this lightning arrestor and the GPS receiver is longer than four meters, consider placing a second lightning arrestor within four meters of the GPS receiver. The second arrestor reduces any lightning-induced voltages in the cable to the receiver.
These units use separate RF (DC-Blocked) and dc paths results through the protectos. This design results in low throughput voltage and energy.