I have two radio nodes, but no throughput is received. How can changing the altitude attribute help?

I have two radio nodes, but no throughput is received. How can changing the altitude attribute help?

When a custom wireless node model is created, the altitude attribute of the model is set to 0.0 by default. This will prevent the radio packet exchange between the radio nodes from happening if the dra_closure closure model, which is the default closure pipeline stage model is being used.The default closure model performs a simple line-of-sight calculation with an assumption that the Earth is a perfect sphere. If the radio nodes have the altitude of zero, then they will never have a clear line of sight unless they are placed on top of each other (exactly same x position and y position).The units of the altitude attibute change depending on where the site is placed. It will take the dimension from the subnet in which the node is placed. For example, if the subnet grid property is set to use kilometers, then the altitude of the node will be interpreted as kilometers. For this reason it is advised that the altitude value is not set on the node model but be promoted. This way you can change the altitude value according the environment that the node is in.For more information about the closure Tranceiver Pipeline Stage or the altitude attribute, see the Wireless Module User Guide.