signal booster

We need to transmit an optical signal over a distance of approximately 24km to an OB track. Currently, we are using Questtel SDI over fiber extenders to connect a Sony PTZ camera, including RS-485 control data. However, the fiber extenders have a maximum transmission distance of 20 km, and we...

I bought a Uniden BC365CRS scanner to listen to air traffic at an airport. I have an office in the airport building about 100 yds away from the radio tower. Yet we can barely get a signal from the tower. I tried buying a different antenna but it did not work. I am looking for advice to boost...