Co-ax cable is typically used to carry high speed data such as
television signals, computer data etc. Assuming that the cable is
installed properly and terminated into the right connectors and
equipment, it is capable of running long distances. The final
distance depends very much on the data rate. The higher the
bandwidth, the shorter the length will be. For example, analog
standard definition television will run 1000 feet or more on a good
quality cable. Broadcast standard digital SD video can run almost
the same distance but HD video is limited to around 300 feet. The
losses at high frequencies are greater than at low frequencies so
the faster data rate becomes more limited. Also, the type of cable
is a big factor. Poor cable can limit a run to, say, 100 feet while
a better quality cable will carry the same signal in excess of 1000
feet. For almost all residential applications, there should never
be a problem with cable length.