How am I supposed to destroy the radar, I used bots carrying radars to look at the bases and found the radar. but I can't find a way across to destroy it, and the artillery are not allowing me to move lasers over with bots.

Hi, there are many ways.

1) there are two radars, one on the western coast (far from you) and second on east with artilleries. The artillery has limited ammo (max 15 I think), so just sacrifices few radars and they will stop shooting eventually. Then you must use for example laser turrets placed by construction bots to destroy defences of the enemy base.

2) you can get to other side by foot, but its very far from your base. Just take your car or tank (very recommended to use tank) and just drive along near the river. You will probably find lots of bug nests blocking the path to other side, so you must kill them first. It doesnt matter which dirrection you will choose on river (but I recomend to use west way).

Turrets and Bots
https://youtu.be/v2B3G7K73b4?t=2105

Car
https://youtu.be/CNFZ5hITKFY?t=3494