Take a look what i just found at amazon:
Their description:
Product Description
PRODUCT FEATURES:Ultra small form factor for ease of installation in confined spacesLightweight powder coated and weather sealed housing for superior corrosion protectionLED power indicatorPassive return6 KV, 3KA combination wave (B3) surge withstand on all “F” portsPrecision machined SCTE compliant sealed “F” portsPatented DSM seizure technology provides better performance than 360 contacts… More >>
Go & get it here - i can recommend it:
PCT 1-PORT BI-DIRECTIONAL CABLE TV HDTV AMPLIFIER SIGNAL BOOSTER WITH PASSIVE RETURN PATH