This is a strange experiment (or not so compared to some of the experiments I've done) that I am currently undertaking, and require your help. I have built an interferometer of sorts. Two metal funnels of diameter 200mm are attached together by copper tubing (20mm?) through a Y junction with all angles of 120 degrees. The distance between the centre of the funnels is 600mm. The lower tube connects directly into an LNB. I am trying to connect the LNB to a voltage data logger via a device called a satellite finder that is basically an analogue dial voltmeter. Currently the software isn't working, but it should do the job. What I need your help with. I don't know if it (what ever it is) will work, and if it does, why? I can't find any (seemingly) relevant equations.