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enter image description here

The description on a web suggest that this circuit will give signals till 100 meters. I am very close to the airport so this is not acceptable. The input is only 3V so I feel the website is wrong.

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Your circuit is not acceptable no matter how far you are away from an airport. Jamming is illegal in most parts of this planet. The range depends on: the battery voltage, the circuit, the antenna coupling, and the exact nature of the antenna.

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That circuit probably won't oscillate, so no worries! What's the purpose of C5? Never saw that before in an emitter-coupled feedback oscillator. And 100k resistor for R2 - is that correct? Seriously, check the circuit. Or look for another source.

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    \$\begingroup\$ One source of this circuit appears to be: electronicshub.org/mobile-jammer-circuit It is illegal to jam cell phone frequencies and given the sensitivity to terrorist and criminal activity, you could easily end up behind bars. \$\endgroup\$ – Richard Crowley Nov 26 '16 at 5:22
  • \$\begingroup\$ This one seems to be the electronic equivalent of a 6C homeopathic medicine (of course intent might figure into what happens to OP). \$\endgroup\$ – Spehro Pefhany Nov 26 '16 at 5:49

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