1. is feasible. For the router, it is required that the signal transmitted by the router is strong, and the weak transmitted signal will be lost with the distance. Moreover, it is best to have two routers of the same model. If there are other wireless devices at the transmitting end, it is best to use the transmitting antenna, as shown in the figure.

The receiver adopts directional receiving antenna. What radar receiving antenna is used as shown in the picture?

, you can use an enlarged version, and the installation direction is opposite. 2. There should be no influence, and the original antenna should be replaced. 3. If the equipment with amplification power is the best, but I don't know if it will change the signal and the antenna has gain effect, don't use the equipment with amplification power. Because you are too far away, there is a better way.