Wind generators on cell phone towers -- are solar panels too expensive?

Some cell phone towers alongside I-78 in NJ now have "windmills" on top. The diameter of the turbine is around 6 feet. They look much like the farm windmill generators in the 30-ties. With many blades. Not just the three as on modern day large scale wind turbines.

Questions:

1. Did I assume correctly, those are electrical generators? (Or are they possibly just "wind speed" and "weather conditions" measurement devices, operated by a company other than the cell phone operators?)

2. Why so many blades? I thought that was the issue with the old farm windmill generators, they were not as efficient.

3. Why windpower? I thought solar panels are the "in-thing". (Are solar panels in fact too expensive to install and service? Do they need bigger back-up batteries, since they do not work at night?)

http://www.energyadvocate.com/fw90.htm

Wind generators on cell phone towers -- are solar panels too expensive?hack myspace

1. If they're 6 foot in size they must be for electricity.

2.So they can be used in low wind.

3.Wind is cheaper and makes more power. Solar has good pr from people who know really nothing about it.

Size of th battery would most likely be the same seeing you can run out of wind just as long as you run out of light on rainy days.

Wind generators on cell phone towers -- are solar panels too expensive?fake myspace myspace.com

The windmills are probably backing up the solar panels when the sun doesn't shine.
Probably wind power for back-up systems.

The smaller dia. multiblade fans would be

dictated by the need not to interrupt the

line-of-sight radio in use.