Homebrew radio astronomy antennas and equipment

An intriguing branch of radio spectrum exploring is radio astronomy. 

It's cheaper than it used to be and it doesn't require a lot of equipment. 

These items that could be helpful if you wish to get into it: 

* WA8SME QST article on building a radio telescope (pdf)

* Marcus Leech Radio Astronomy with an RTL SDR

* Amateur Radio Astronomy by F5VLB

* Joachim Koppen's Fundamentals of Radio Astronomy

* Build your own Radio Telescope by Bogusław Malański & Szymon Malański

* Mike Brown's radio telescope

PS: Like something to read? Books by Peter Parker VK3YE are read worldwide and have been favourably reviewed.  Available in both electronic and paperback.