Bad radio reception

Hi guys,

I am having a bad reception on my radio.
I have to say that my radio was replaced by new one, the problem started after that, although the radio I bought should be a good one.

I think that how ever installed the new radio, did lazy job.
I opened it all again to check if I can see the problem.

I check the antenna cable that goes from the radio to the antenna, there is no connection (resistance is 1).

I also saw that there is another cable that should supply power or something. Is that cable is for some kind of amplifier?
I saw that it is not connected at all (no electrical current).

Is this the problem?
Do you have any kind of advise?
Do you have a wiring diagram or something that can help me?
Does antenna cable should be connected? (Show resistance 0)?

Thank you very very much
Amir