Unless the frequency turns out to make this design prohibitavely small, try a Moxon: http://www.moxonantennaproject.com/design.htm/

I built one for OTA TV broadcasts (somewhere in the neighborhood of 500 MHz) using spare wire I had laying around and had good results. There's a calculator program at that URL that will give you the dimensions of the elements for any given frequency. All you have to do is bend the wire and find a way to keep them at the required distances.
If your antenna needs to be really small you could get some copper clad from RShack and etch/scrape out the elements.

"I, for one, welcome our new insect overlords." Sorry, but the perfect oportunity to use the original quote doesn't come up every day...

When did beginnig an argument with "This." become en vogue? Is it supposed to show the superiority or finality of your argument? If so, for me anyway, it does the opposite. Also, using a generalization to argue against a generalization isn't the most stable basis for an argument.

Based on my very limited radio knowledge I suspect because AM requires a MUCH larger antenna and a good ground for effective reception. Ref: http://radiomagonline.com/transmission/antennas/radio_antenna_basics/

Has anyone seen any other pictures of this thing? I've only ever seen the official government one and the bottom looks photoshopped to me. Maybe to cover over the carnage or something? I'm not doubting its existence or severity, I'd just like to get another perspective to gage depth and whatnot.

In a four inch scope the planets are a good option. Jupiter and its satellites are always fun to look at and you should easily be able to see cloud bands on the planet's surface. If you're lucky you can likely even see the shadows of the moons cross the surface of the planet. Saturn is a must if at all possible. Unfortunately in the spring Orion may not be visible in the evenings so that rules out the Orion nebula (the only naked-eye nebula for the Northern hemisphere - not sure if there's anything down South). The Andromeda galaxy might be a good representative of a galactic object although there won't be much detail in a scope that size. I recommend checking out skyandtelescope.com and doing a search for local amateur astronomy groups in your area. You will likely find a local group that is willing to donate their time to present to your students and make their instruments available for an evening or more. They likely have 'scopes that far outstrip the four inch scope you already have access too which will give access to a whole range of diffuse and distant objects like galaxies and nebula.

NASA's Astronomy Picture of the Day

http://antwrp.gsfc.nasa.gov/apod/astropix.html

Did the helium ones remind anyone else of the gunships from HalfLife 2?

Come on people. Pay the $5. This is the exactly kind of behavior we keep asking for! They're releasing the source and not treating us like we're all thieves. Let's reward them for giving us the benefit of the doubt.

Besides, if you could afford to buy yourself an iPhone or iPod touch, you can likely afford it. (Especially considering what ATT charges for data packages.)

I'm no statistician, but I found this link interesting: http://www.ojp.gov/bjs/fed.htm It looks dated, and given the source our resident tinfoil haberdashers will likely discount it, but I find it interesting that a significant portion of the folks charged aren't necessarily prosecuted. I think that would likely skew the conviction rates that some are citing.