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GTHill Escribi?3:

You will not receive the same signal.

This type of antenna doesn't actually exist because it would be an antenna with no length.

Gene

This is actually happens to be one of the two constraints of an Isotropical Radiator.

I think the example given by gene, the sun light through a hole and magnifying glass is a very apt example.

Another example would be a flashlight. Using a flashlight that has a bigger diameter, will spread the light on a wider area and will not go too far. (This for example, can be an antenna of 3dbi)

But if you use a flashlight with the same power as the flashlight above, but with a small diameter, it focuses the light into a narrower path and the light doesn't spread over a wide area but can reach longer distances. This is what happens when you increase the gain of an antenna. (this can be an antenna of maybe 10dbi )