There are some advantages to using dual... if you have a specific type of interference at times. Presently, the server will only use one channel of information to 'locate' a signal. The E field can send three. H field has two channels. Together they offer 5 channels... best one wins. E field is expressly designed to be used under about 500km. H field for longer distances, generally. Later, with some of the project goals, and the data that can be used, overall system performance will likely be better with a dual operation, that is, the network data will be enhanced. The reason is that some specific characteristics of a lightning stroke can be determined with E field signals, other characterists with the H field, depending on environment, distance to cell, etc.
Your system amazes me, and others... you are doing well with only E field. This is the first indication you also had an H field amplifier and antennas that you could add... Outstanding! There is a big difference between the two... build it up, hook it up, and have even more fun!
Way to go, Francisco!