Radio frequency amplifier

[Nacho-RT74]

I know they were available, I had seen them before on ebay, but dunno remember the keywords or was just casuality when I found. the deal is I can't find them anymore right now

where I find them ?

[Plumcrazy]

Is this what you're looking for?
http://www.crutchfield.com/App/Product/Item/Main.aspx?search=car+radio+antenna+booster&i=12044UA60

[Nacho-RT74]

yeah kinda off, but I didn't like the note:

Antenna boosters can improve reception of a distant station, but they work best in relatively flat country with few obstructions. They are not effective with interference caused by mountains or large buildings.

Caracas is a valley with dozens of internall valleys, however being the stations are all on same valley, maybe

[Chatt69chgr]

Are the stations all FM stations?  If so and you have a extendable antenna then adjusting the length might help.  Ought to be the same length as the solid stainless whips that were used starting in the early 70's.  Is the coaxial cable connecting the antenna to the radio good---probably only way to test would be to substitute another antenna and cable?  Is the radio itself adjusted and working properly.  If it's a original radio then it might need to be sent in to some place like Wards and be tuned.

What they mean by works best in relatively flat country etc is that FM radio signals being in the 88-108 mHz band don't like to propogate through large obstructions like mountains.  AM being around 1 mHz is a ground wave that does better in this respect (but requires a long antenna to be most efficient).  The way that commercial FM stations deal with this problem is with transmitter power.  But unless you really have a lot of power then they will go just so far unless their transmitting antenna is on a mountain top in the area.  Generally speaking, they are line-of-site but closer in will penetrate bldgs depending on how close you are to the station and how well shielded the bldg is.   

[Nacho-RT74]

I could try a new antenna thougt, after all is a cheap chinesse powered unit. But not too much to choose around.

yes is the original radio. I want to get AM too, but dunno why AM stop to work... probably selector switch went bad. was working at first instance.

well being outisde USA, shipping to make a rebuilt job will be the same cost than get another unit