Geographical limitations of terrestrial UHF TV reception and antenna array gain effects

Firstly I'm sorry if my question is Dump I'm not a Communication Engineer , I'm production Engineer

What are the geographical limitations of tv reception system of terrestrial UHF ?
What if I used antenna array to incrase gain ? Is that can help me receive far stations ,
Is Analog transmission has more coverage than Digital transmission



Thanks in advance

For starters, you have to have a signal of some sort before increasing the antenna gain can even be considered. A marginal signal may be arriving due to for example refraction or reflection, which can change with time. To be quite sure you need line of sight, which may mean elevating the antenna, for example, trees in our area very effectively block marginal signals. Antenna gain is achieved at the expense of directivity, with high gain antennas it becomes more difficult to locate and maintain a good signal path, mechanical stability becomes important. A lossy or long antenna cable can be compensated for by an appropriate mast head amplifier, but this does not help if the received signal is marginal.
The trend is for digital transmission at higher frequencies. It is freeing up a lot of the old TV channel frequencies (VHF) for other applications.
This is a very general answer, there are plenty of others out there that could give more specific details,
cheers,
Richard

Thank you Mr. Richard . your answer helped me to understand if I have no signal .. I cannot amplifiy it .