inspired by a series of posts on the subject of antenna gain - I did a little Googling. My quest was to find the highest gain antenna ever uilt - I guessed it might be a large parabolic dish as used by NASA etc. But what is the actual * gain * in dBi ??
There is a famous 305 metre diameter dish in a place called Arecibo in Puerto Rico - it is reckoned to have a gain of * 70dBi * at 2.38 GHz.
The best antennas however are part of the " Deep Space Network" - a worldwide system of steerable parabolic dishes that range from 34 to 70 metres in diameter. These are reckoned to have gains of about * 80dBi * in the 2.4 GHz range.
What's so special about 2.4GHz ?
Scientists discovered several decades ago that this band is the one most used by Aliens for broadcasting pop music across the Galaxy.
..... Phil