When installing coax cable externally it is very important to ensure the cable is weatherproofed. This is critical because any moisture entering the coax cable will produce a large increase in the level of loss. If any moisture passes into the dielectric material it will cause impairment to the performance of the dielectric, and also increase the level of loss. It is extremely important to seal the end of the cable if it’s used externally with the proper connector to ensure that no moisture enters the connector and in turn the cable. It is also important to ensure that the outer jacket of the cable remains intact and is not damaged during installation in any way.