So the RF guys in our satellite company are not optimistic. A quarter-wave monopole antenna like our standard fin-shaped transponder antennas mounted on a grounding plane will radiate almost entirely downward. The radiation pattern looks like a flattened torus (flat along the base plane of the antenna) with zero radiation on a perfect vertical.
I wonder if we could simply put an omnidirectional antenna in the tail... I'll ask my avionics guy.
The ‘other’ ADS-B
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Re: The ‘other’ ADS-B
FlightRadar24 also give free access to thier top level plan if you contribute data, they will even send you a receiver if you are somewhere they have a coverage blackspot, https://www.flightradar24.com/apply-for-receiver