Antenna selector circuit diagram electronic project

This antenna selector circuit diagram electronic project is designed using common electronic components and allows switching between two FM antennas via a logic signal.
Gates IC1b and IC1a provide switching and interface between the logical form of 5 and 12 V supply voltage, required for selection. When input A is logic state H, IC1a's output will be L and that of IC1b will be H. In this case, current will flow from the positive supply terminal to IC1a, through T2 R9 and D8; T2 lead and D9 light.
When input A is logic state L, then IC1b is L, the current flow from source to IC1b positive connector, through Q1, R7 and D7, then T1 is open and D10 light . Meanwhile, the two relays connected in series, RE1 and RE2, are placed under voltage, their contacts close and VHF signal appear at C input and D output