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Hi
I have listening equipment that covers the broadcast band to 30 MHZ
and 100Khz - 20 GHz (a spectrum analyser).
I have spent a lifetime in radio communications and have listened to the noise in the 20-30Mhz region but never heard anything I could identify as coming from space so it is really not something that I would expect a novice to have much success with.
A highly directive antenna for the 20 - 30 Mhz band will require a few hectares of space and if you want to be able to point it, well that is another story..
A yagi is probably the simplest type of directional aerial to build or a modified version called a cubical quad can reduce the size but they do not have a very wide bandwidth and will need to be built to the correct size. These types have directional properties that become sharper as the size increases.
A wide band directional aerial is the log aperiodic but these will be bigger than a similar performing yagi at a single frequency.
If you have suitable receivers directional aerials for UHF and Microwaves can be built much easier. There is space noise in the 400Ghz region and the Sun gives out a lot of RF in the 1420Mhz Hydrogen radiation. These aerials will be directly pointable to the noise source so you will be able to see where it comes from.
I am in the process of re-commisioning the 1420/400 Mhz dish aerials at Wiruna but have not reached the stage of actually looking for signals. I have made a dipole feed for the 1.5 metre dish and will try that next time I go to Wiruna.
Barry
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