In the past, the higher the installation position of ordinary TV antenna, the more TV channels it received?

The TV antenna you mentioned is used to receive the terrestrial broadcast signal, which comes from the local terrestrial TV transmission tower. The strength of the terrestrial TV signal that the receiving terminal can receive depends on the linear distance between the receiving antenna and the transmitting tower, and also depends on whether there is a high building block between them. The TV antenna is placed outdoors and high in order to minimize the influence of building occlusion. But as you said, when the antenna has reached a certain height, which exceeds the height of the building that may block the signal, it is of little significance to continue to raise the position of the antenna. Because the linear distance between the receiving antenna and the transmission tower has not been significantly shortened because of the increase of the receiving antenna. On the other hand, the signal received by the antenna will be attenuated in the feeder connected to the TV. The longer the feeder, the more connectors and the more attenuation.

Conclusion: After the outdoor antenna reaches a suitable height, if the height is continuously increased, the best viewing effect will not be obtained.