There is only one radio dish antenna at cell phone tower used to connect one tower to another. How this antenna able to do its job (Tx and Rx) at same time? Also, to communicate between cell phone and tower, are there different antenna? And how cell phone acts as a Rx and Tx using same antenna and same system? :|
At lower freqencies they are are commonly used to share send antennas.
I was once the site manager (in the 1970's) for HF comm site that had over twenty 20Kw transmiters connected via massive HF frequency 'Diplexers' to very large log periodic and discone antennas.