Telescopic Antenna
by admin on Tuesday, January 20th, 2009 | No Comments
Telescopic Antenna
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 Ham 28MHz 51 inch BNC HF Telescopic Antenna For QRP  US $15.99
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 HAM RADIO BNC VHF 136 174MHz TELESCOPIC ANTENNA US $6.50
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 Telescopic Whip Antenna 10 pcs US $4.99
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 SMA MALE VHF TELESCOPIC ANTENNA US $6.50
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 SMA FEMALE VHF TELESCOPIC ANTENNA US $6.50
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 Black Whip 455 inch Ham BNC 144MHz Telescopic Antenna US $8.99
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 455 inch 140MHz 150MHz Ham BNC Telescopic Antenna US $8.99
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 135 155MHz TELESCOPIC 425 2M BNC HT ANTENNA NEW US $16.95
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 223 Ham UHF 420MHz 450MHz SMA F Telescopic Antenna US $8.99
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 SMA MALE SMA P UHF TELESCOPIC ANTENNA US $6.50
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 NAGOYA NA 774 BNC Dual Band Telescopic Antenna NA774 US $8.57
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 NAGOYA NA 774 BNC Dual band TELESCOPIC Antenna FOR Icom US $8.99
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 5 013 145A SMA female VHF 145MHZ TELESCOPIC Antenna US $8.34
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 150MHz 160MHz SMA M 245 inch Telescopic Antenna US $8.99
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 Black Whip 24 Ham 144MHz BNC Telescopic Antenna US $6.50
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 Smiley Antenna 440 Mhz 5 8 wave telescopic gain antenna US $19.95
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 NAGOYA Handheld TELESCOPIC Antenna NA 773 144 430 SMA US $7.99
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 VHF UHF folding telescopic antenna 144 222 430 MHz US $9.99
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 5 013 430 SMA female UHF 430MHZ TELESCOPIC Antenna US $9.00
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 SMA FEMALE SMA J UHF TELESCOPIC ANTENNA US $6.50
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 5 008 460 BNC 460Mhz TELESCOPIC Antenna US $6.04
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 NAGOYA NA 774 BNC Dual band TELESCOPIC Antenna F Icom US $8.52
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 5 008 410 BNC 410Mhz TELESCOPIC Antenna US $16.00
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 5 013 145A SMA female VHF 145MHZ TELESCOPIC Antenna US $9.00
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 Nagoya NA 774 BNC Dual band telescopic antenna NA774 US $8.57
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 5 014 410 BNC UHF 410Mhz TELESCOPIC Antenna US $10.00
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 5 014 460 BNC UHF 460Mhz TELESCOPIC Antenna US $10.00
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 NAGOYA NA 774 BNC Dual band TELESCOPIC Antenna F21 31 US $8.99
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 NAGOYA NA 773 BNC Dual band TELESCOPIC Antenna US $8.99
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 5x 140 150MHz 455 BNC Telescopic Antenna Ham 144MHz US $25.99
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 5 021 430 BNC UHF 420 440Mhz TELESCOPIC Antenna US $11.00
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 223 Ham UHF 420MHz 450MHz BNC Telescopic Antenna US $8.99
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 BK Precision AT 1 Telescopic Antenna US $10.85
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 MOTOROLA 2 WAY RADIO VHF TELESCOPIC FOLDING ANTENNA US $7.50
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 2M135 155MHz BNC TELESCOPIC HT SUPER ANTENNA US $20.00
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 5x BlackWhip 455 144MHz Ham BNC Telescopic Antenna US $25.99
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Optimum length for my scanner antenna ?
I have bought a telescopic antenna for my scanner. I am interested in listening to the VHF frequency 130 MHZ. I can extend my antenna upto nearly two meters, but for this frequency,what will be the optimum length of extension ?
Optimum is a quarter wavelength for a whip aerial.
Wavelength (metres) = 3 x 10^8 divided by Freq (Hz)
i.e. 3 x 10^8 div by 130 x 10^6 = 2.3 metres
A quarter wavelength for 130MHz is thus 0.577 metres.