Ah, thank you. I didn't realise it was that bad.
To be honest, I'm trying to find a way to locate my grandpa (who is suffering from dementia) within my grandparents' house/yard as he sometimes wanders off during the night. If he had an RF transmitter, or at least those were the lines I was thinking along, in his pocket, sending a signal at an interval, using a receiver as a rough "hot-cold" estimate would make it easier for my grandma to find him by giving a rough estimate of the direction she should be moving in. Or so I thought. Now I'm trying to figure out something else that might work better. Maybe to have something like a "compass" that would point to the direction from which the signal of the transmitter (the components that would be with my grandpa) is coming somehow... Thank you.