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The Quadrifilar Helicoidal Satellite Antenna is another option satellites. I have heard that these antennas work very well for on both the transmit and receive side of satellite operations. Here’s a site with information on how to build one –
Quadrifilar Helicoidal Satellite Antennas
Looks like an interesting project…
This page makes an interesting point about an alternative to a ubiquitous term (not necessarily related to satellites):
There is no such thing as gain in an antenna. This is one of the most difficult things to teach my students. This term was established many years ago, probably for commercial reasons…
The correct term is directivity – i.e., the capacity of antenna to direct the available power into one preferred direction. This looks as a gain in the correct direction, but the power was ‘stolen’ from elsewhere.
The normal illustration of this is squeezing a balloon to redirect some of the power from one direction to another direction.
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