How can I make a radar, the sense that the enemy planes, ships, missiles, equipped troops and a large variety (45 miles)?

I am very, very limited resources of money = $ 45 = Hammar tools, nails, wood, markers, drill, screws, glue, … ability = degree 8 years = 16 = food box school lunch and Pepsi = time = 5 hours teaching science professor and laboratory of InCharge

you = prick

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