so if you already had a base set up on a tripod, you would set the LS on the fence post at zero antenna height. Take the shot. Move the T-3 to post and set it at zero and carry on with base /rover set up. on the post.I use a zero antenna height when I set the base on my truck or a fence post. i don't care about the elevation of the ground below the base when I do that.
Thanks Adam