Looking for a compact 1 MHz AM antenna

I have a micro power AM transmitter that I'm using for some basic non critical remote control tests, problem is I know jack about antenna design. I do know that normal AM antenna's are very large, I need a very compact antenna though. The transmitter is the size of a dime and I want the whole unit to be about the size of a pack of cards and get at least 30-100 feet of range out of it, I can boost power a bit to brute force the range if I have to but I need at least a moderatly efficient antenna. Any help would be appreciated.
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Oh yeah "duh" It needs to be center tuned for 1mhz (or thereabouts) some way of changing the frequency would be nice even if it involves constructing more than one antenna.

A coil of wire with as large a diameter as possible is the only option. The power transfer to the receiver will be magnetic coupling rarther than radiation at the distance you are talking about so the more turns of wire the better.

If you tune the coil to resonance with a suitable capacitor then the antenna impedance will be the resistance of the wire. The "radiation resistance" will be tiny compared to the wire resistance. Your transmitter may not like a low impedance load so you might be better off keeping the inductance.

It might be best to have the axis of the coil vertical so you get coverage in all directions aroudn the transmitter.

A little more info would be appreciated, for example can I test this using a spool of magnet wire? (a couple hundred feet) I think the spool diameter is about 1/2 an inch, not that big but might work for a first test to see what kind of range I get. This is basically just a coiled whip right? So I only have to attach one end to the transmitter output? Also how would I go about using a cap to tune the coil? I'm really a complete idiot as far as RF goes, I deal mainly with low speed digital and that just for fun. This antenna is actually going to be fed from the I/O pin of a micro controller. I know there's a lot of harmonics involved but this is only for testing and low power. It works just fine using a short piece of wire from the output and placed near the antenna of an AM radio, but it only works at a distance of a few centimeters. 30 feet would be nice, 100 absolutly fantastic. But honestly I'd be happy with a couple feet right now, just to get my feet wet. A nice simple 'X turns of X gauge wire at diameter X using capacitor X" would be very nice =)