One problem that many people run into when trying to expand their home entertainment options is that coaxial cable is designed to provide a signal to a single device. This can be especially frustrating when you're trying to add a second television or attempting to divide a cable signal between a television and a cable modem. An easy solution is to use a coax cable splitter. A cable splitter allows you to take a single coaxial input and divide it into two, three or four outputs, which can all be used to run separate coax cables to different devices. A coaxial cable splitter can be installed in a manner of minutes and requires no additional tools (provided that all of your cables already have connectors on them).
Attach the coaxial cable splitter to the coax cable that you wish to split. Do this by inserting the wire of the cable's connector into the splitter's input connector, then turning the cable connector to tighten it into place.
Attach additional coax cables to your splitter, tightening each against one of the coaxial cable splitter's output connections. Keeping each length of cable tied or wound will help you keep them organised until you run each to the device you wish to connect to the cable.
Position the coax cable splitter next to a support beam or other solid object if you wish to secure it in place. The splitter will have at least one or two loops in its body that are designed to allow it to be fastened in place with screws. This can be especially useful if your cable is run under the floor and you want to ensure that your splitter doesn't come loose and get wet from ground moisture.
If you have coaxial cable that doesn't have connectors on one or both ends, you can purchase connectors in either twist-on or crimp-on varieties.
Splitting the original cable feed drops the output power to each device, which could result in poor picture quality.