FIRST: You really ought to rephrase that subject line.


As to the mailbox activity whatchamcallit, try putting a proper
directional antenna on the TX unit (the mailbox transmitter.) I vaguely
recall the device. I have no clue what frequency it may use, but I'm
sure someone here will know it. Then wire a directional antenna on the
RX unit (the house side.) You might also try placing the entire
receiver at this garage you speak of, and use a 4 pair cable to the
house to feed the LED, buzzer, and reset signals back to the dwelling.
You will likely have to buffer or isolate these with either transistors
or relay circuits to overcome the loop impedance of the cable, depending
on how fussy the box is.

Even though it might seem so, this is not likely to be too complicated.

Have fun!
Pat