Different forms of antennas

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Does anybody tested some other antennas than just a straight wire or a curled wire?
Whats about a dipol antenna?

I tested these, they came from an old kaku sensor, but straight 17,3cm wire worked better. My pimatic box works even better than homewizard.

http://cl.ly/image/2t1P383A3L25/50562F08-9D73-4836-94A5-09E6593BD23A.jpg

I have made some tests with different 433MHz Antennas.

They are Mono-pole and Di-pole Antennas. One Antenna has a Gain of 2,15 dbi (SRH-771)
http://www.thiecom.de/diamond-srh771.html

But the problem is with higher gain more relative is the polarization of the field.
I got a extreme range with the 771 antenna but only when both fields in the same orientation.
A plug in the next room i cant switch when it lays on the ground but ave i turned it a little bit works very well.
I ended with simple mono pole antennas.

Do you use the 771 for receiving or transmitting? The antenna doesn’t look lika a specific 433mhz antenna?
I*m just at the beginning to learn how antennas work etc… but would’t it be better, for receiving, to use a antenna thats specific for 433mhz to reduce noise?

The 771 is a 433MHz Dipol antenna. In RF technology is not the frequency signed, it is the the wave length. 433MHz is equal to 70cm Wave length.
A lambda/1 mono pole antenna has a length of 70cm for 433MHz.
A lambda/2 is about 35cm.
A lambda/4 is about 17,5cm
The bigger the antenna is the higher is the possible gain.(not exactly right but in most times)
The higher the gain of an antenna the higher is the polarization cut.