18gain or 30gain

hi just wondering does anybody know the differance between aerials with high gain and low gain and which aerial would you use for n*l mmds in co galway and where would get it from .i know the downconverter is between 222Mhz-408Mhz and the power supply is stander enoght ,its just the aerial thats got confused . i am about 13 miles from the n*l transmitter in toomabrackey galway


any help would be great
thanks everyone

 

anyone out there? please help me!
pleaseeeeeeeeeee

 

Most of the downconverters you get are standard gain ~ 30db .Some go up to 37db.
The actual aerial component can vary from 12 db (Corner Reflector) to 24db (Large Grid).
Yagis are ~14db and small grids ~18db.
As you are relatively near the transmitter you shouldnt need too much gain.
A Yagi or small grid should be sufficient.

 

thanks for the help
fano

 

can the gain on an aerial be to high or would it make any differance

 

If you are very near the transmitter (< 2 miles) then the signal strength can be too strong.
You are far enough away so the more gain the better.

 

thanks again fano ,let ya know how it all works out