For protection from the rain, you may need to waterproof your dish. Be sure to use a sealant that will not harden when it dries. If the sealant hardens, it may become brittle over time and crack. This will allow moisture to enter those areas in which it may be damaging. Applying an accordion sleeve on the actuator arm and a weather cover over the feedhorn will also help in protecting your equipment from water damage.
Satellite dishes are prime targets for lightning strikes.
Consult a local installer for ways to avoid such damage. Leaves and pine needles contain moisture, which scatter satellite signals. Pruning surrounding trees will prevent any signal loss due to obstruction and moisture. You may have been off a subscription channel for an extended period of time. This could cause your videocipher to lose its automatic authorization.