Yes. However, early antenna systems used flat feeders, which were not coaxial cables.
RF coaxial cables need to be understood in two parts.
RF: RF refers to electromagnetic frequencies that can radiate into space, ranging from 300kHz to 300GHz.
RF is radio frequency current, a shorthand for a high-frequency alternating electromagnetic wave.
Alternating current that changes less than 1000 times per second is called low-frequency current, and that that changes more than 10000 times per second is called high-frequency current. RF is such a high-frequency current.
RF (300K-300G) is a higher frequency band within the high-frequency (greater than 10K) range.
In electronics theory, when current flows through a conductor, a magnetic field is formed around the conductor; when alternating current flows through a conductor, an alternating electromagnetic field is formed around the conductor. This is called an electromagnetic wave.
Electromagnetic waves with frequencies below 100kHz are absorbed by the Earth's surface and cannot be effectively transmitted. However, electromagnetic waves with frequencies above 100kHz can propagate through the air and be reflected by the ionosphere at the outer edge of the atmosphere, enabling long-distance transmission.
We call high-frequency electromagnetic waves with long-distance transmission capabilities radio frequency (RF).
RF technology is widely used in wireless communication; cable television systems use RF transmission.
Coaxial cable: Because the two conductors (inner conductor/outer conductor) are asymmetrical with respect to ground, with one inner conductor located at the axis of the other cylindrical outer conductor, it is called a "coaxial cable."
A characteristic of coaxial cables is that the electromagnetic field is essentially enclosed within the outer conductor, allowing for use at higher frequencies.
Note: The outer conductor of a coaxial cable is both a conductor and a shielding layer (acting as both a loop and providing anti-interference functionality).
A coaxial cable used to transmit RF signals is called an "RF coaxial cable."
The signal received by the antenna is transmitted to the front end via a feeder line, and the signal output from the front end is also transmitted to the various receiving devices via the feeder line.
Nowadays, we often see connection and transmission feeders used in signal amplification systems such as first-line wireless signal towers (China Mobile, China Unicom, China Telecom, etc.), tunnels, and basements.