There are several reasons:
1.Due to it's coldness and hostility, it is scientists closest example of the surface of Mars, meaning that some tests can be done here rather than in chambers or on Mars. Furthermore, if life can exist far into Antarctica e.g. Lycon, then maybe life live in similar conditions on Mars
2.Due to it's lack of air pollution, Astronomy tests can be done on Earth where it would usually be hard to do them. Also, tests involving air can be done as it has clean air.
3. Antarctica is the least known continent by long way, with it's under water lakes, its frozen and mysterious waters, its crystal formations and volcano caves. There is a lot to explore. However, such explorations don't usually come from bases all the time, mostly from around the world, including 'Frozen Planet'.
Another Answer
Antarctica is governed -- as is all land south of 60 degrees S -- by the Antarctic Treaty, which preserves the area for the scientific study of the health of planet earth. The treaty was signed by governments representing 80% of the earth's population, and many of these government establish research bases on these lands.
You can read more about current research at each base -- there are several -- below.
There is no single base camp in Antarctica. Most research stations are located near the continent's coasts.
Each country supports its own research station on Antarctica. All of Antarctica is "controlled" by the Antarctic Treaty.
It was used for scientific research.
By international agreement Antarctica is only used for scientific research.
There is no New Zealand 'base camp' in Antarctica. There is a research station -- Scott Base -- supported by the New Zealand government. You can find it on Ross Island, connected to the Ross Ice Shelf.
Tents are not the most-used shelters in Antarctica, but can be used by field teams. The most common shelter in Antarctica is a research station facility.
The Comandante Ferraz Brazilian Arctic Base mainly performs research in Climatology, Astrophysics and geophysics, and oceanography.
New Zealand has one research base in Antarctica which is know as "Scott Base" after Captain Robert Falcon Scott
they used helicopters and snowmobiles
Research stations in polar climates, especially on Antarctica, are committed and dedicated to studying the health of planet Earth through science.
Two research stations claim French support:Concordia Station, in joint support with ItalyDumont d'Urville Station