Nobody ever said we do not need radio antennas. In every radio there is an antenna or else it couldn’t operate. However, due to the long experience of radio, developments have been able to squeeze the antenna down to a tiny size.
TV on the other hand is comparatively new and while tremendous strides have been made in antenna developments, little shrinking of the antenna has taken place.
The reason is the high frequencies that TV operates at in comparison to radio. These high frequencies are much more susceptible to losses of strength.
They won’t travel easily through structures and have a limited “line of sight” range. In order for you to grab yourself a workable portion of these electromagnetic energies it is advantageous to have an antenna cut to absorb the wave lengths, outdoors and up high.