it would be helpful if you gave some details such as:
1 what is this being used for
2 what environment is it working in (indoors, outdoors, home, industrial)
3 required range in km or miles (or feet or meters)
4 what type of signals, analog, digital, audio, control signals????
5 what frequency band(s)... makes a difference in Line of sight, non-line of sight, through walls, foliage, etc...
we can only give answers as vague as the questions.
"I'm sorry Detective. My responses are limited. You must first ask the right questions."