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RF signals, amplifier for TV range

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Dragon65

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What amplitude has radio frequency signals reaching of antenna? In particular signals of TV.
I need to create an amplifier for antenna, cause I must to know what signals I will have to deal with.
Frequency band of our TV is 40-900MHZ
 

Depends on the distance between antenna and transponder.Saying that 30-60 dBuV at the output of a Yagi-Uda antenna with a 10-18dB Gain.Maybe less maybe more respecting to the distance,antenna position,antenna matching,analog-digital...etc.etc..
 
Sorry for strange question dB suppose logarithm of fraction right) I figured out that dbm is decibel milliwatts. I thought that amplitude must be in volt. I beginner in design of devices cause could you explain why dbm is convenient way?)
My goal is to amplify the signal without distortion, the questions connected with power I yet not considered.
So if it gives something to you the supply voltage that required in my amplifier is 5 V, is this enough for modern signals or not?
 

Is this weak TV signal strength a new problem?
1) A new TV that has a defective RF amp?
2) Broken antenna (or the wind rotated it?) or broken cable?
3) A new mountain or apartment building popped up between the station and your location?
Frequently an RF amplifier gets overloaded by strong local stations or simply amplifies its own noise.
The RF amplifier in a TV is very sensitive, is tuned and has auto gain control.
 
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