1) Can a relay be used for antenna sharing (SPDT relay)
2) If i use 2 antennas but only 1 module will be powered up other will be in low power mode(virtually shut down) cant i use 2 antenna in that technique

3)If im using this technique cant i use the relay cause only 1 will be activated at a time
4)If im using this technique cant i short the TX and RF (RF input and output) and tie it to the antenna cause only 1 will be activated at a time