Newbie with questions

I want to buy 2 boxes. My sister lives on a massive hill and I am below. Is that good to wittness?
When can I buy a miner?

It really depends on distance too. The stock antenna would be your best bet as this dbi strength makes a bubble-type shape for coverage, where as the higher dbi antennae beam more horizontally and less upward. So there are a few sites that offer service to simulate earnings and witnessing. I suggest joining Vosk’s discord as well. There are a lot of helpful people there and links to important information. As far as when you can buy, i believe most of the vendors are still selling. The question is when you will receive the miners. They are all on backorder and there is at least a 3 month wait, at least.