coils on mobile antennas

[BOOTY MONSTER]

Booty Monster, how does somebody come up with a gain factor on an antenna?

depends on who that somebody is ..........
for similar designs , the larger the gain claim difference the more likely there are errors , location/terrain skewing as well as manipulation/lies are not uncommon either .....

heres what Sirio uses .

http://www.gain-master.it/technologies.php

"SIRIO has made comparisons with the best antenna on the market, with the aid of sophisticated equipment such as:
- Electromagnetic computer simulations carried out with *CST Studio Suite 2008.

- Far-field signal analysis with portable Spectrum Analyzer FSL-6 *Rohde & Schwarz.

- S-parameters analysis in time and frequency domains with 8753ES Vector Network Analyzer and E5071B *Agilent Technologies.

- RF power tests with directional sensor NRT-Z14 (25MHz-1GHz) *Rohde & Schwarz.

- Coil thermal image with *TESTO 880-3.

- Data collection from instrumentation and post-analysis with software developed by Sirio with LabView2009* National Instruments.

- Materials and components tested at extremes temperature with Vötsch climatic chamber VC4018 Vötsch Industrietechnik.

just a little bit more technical than walking around with a meter and relying on radio S-meters with who knows what effecting their antennas .