Is there an relay or email radars?

I live in sky box own like 20K sq.m of land need some radar using relays or emails...


Thanks

Would you please elaborate on that?

The best way to relay information to a skybox would be to use repeaters that use llShout like so:

integer chan = 12345;

default
{
    state_entry()
    {
         llListen(chan, "Repeater","","");
    }
    listen(integer chan, string name, key id, string msg)
    {
         llShout(chan + 1, msg);
    }
}

Then set the things around a hundred meters or so apart. llShout has a range of about 100m.

Alternately, if the number of repeaters is prohibitive, you can indeed use llEmail, llGetNextEmail, and a timer to get the job done.