About Antenna(urgent!!!!!)

I need to receive the frequencies ranging from 100Mhz to 1Ghz.
Is it possible to buy an antenna which can receive these frequencies in the market?
If not, do you have any suggestions if I want to make the antenna?

thank you~~

I think a spiral or logperiodic antenna can be designed for that frequency range. You can look for EMC testing antenna on the web, for example.

Yes it is. The antenna you need is "Discone", like this one:

http://www.grove-ent.com/wrax71c.html

Of course, there are many other manufacturers to choose from.