LigoWave´s link calculator is a link planning tool available online at www.ligowave.com/linkcalc/. The link calculator allows users to calculate link performance expectations taking into account geographical information, distance between the units, antenna height and gain, transmit power, and other factors. This tool is offered free of charge, and users only need to register to get quick and easy access to this very helpful tool. Additionally, each user is able to save and create a database of links, download a PDF document that contains all the necessary information about the link, and publish a hyperlink online so that it could be shown to other people during the evaluation process.

---> this linkcalc example