What is component 4 in figure T-3?

The schematic symbol for an antenna typically looks like a vertical line acting as a small mast, topped with a branched, Y-shaped, or inverted triangle design. Component 4 in Figure T-3 features this exact classic 'forked' design, indicating it is the point where the radio frequency signal radiates into space. This symbol is highly distinct from other components in the circuit. It should not be confused with a ground symbol, which consists of a vertical line ending in horizontal lines of decreasing length at the bottom. It is also distinct from a dummy load (represented by a resistor) or a transmitter (represented by a larger block diagram box).