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W2OR/4 -> RE: Icom 91AD replacement HT antenna (2/16/2007 1:15:41 PM)
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I've used three non-Icom antennas with the 91AD, and the one that suits me best is the MFJ "Ultralight-S" that comes with nine feet of thin, flexible coax, hard-wired at one end to the antenna, and the other end of the coax has a SMA connector fitting directly to the 91AD. The unusually light-weight coax and light-weight antenna allows the antenna to be easily elevated, or placed elsewhere for better signal strength. The mini magnetic mount holds the antenna on the car roof, or on top of an outdoor lamp or other metal object outside the shack. This "Ultralight" model number is MFJ-1722-S. See specs, below. The "S" model of this antenna has the required SMA connector for direct connection to the Icom 91AD without the need for adaptors.
There is another model of the -1722, with a different connector, so, when ordering, ensure you are asking for the "S" version with the SMA connector.
The user can also unscrew the stock antenna element from the -1722-S's magnetic mount base, and replace the element with a another pre-cut element of different length, for different band usage, as desired, using the standard formula for element lengths.
Advertised Specs for this anetnna follow: 144-148 MHz plus 420-450 Mhz. 2.5dB gain on 2-Meters, and 3-dB gain on 440-MHz band. VSWR less than 1.5:1. 50-Ohm, of course. Radiator is a 20-inch stainless steel black whip, very thin, and one which is very difficult to notice when mounted on top of the car. ((I cut off the top 5/8" of the antenna for better SWR on the frequencies I use most.)) The coax is nine feet, of the very thin RG-174U, hard-wired to the magnetic antenna base. Power: 50-Watts on 144 MHz band, and 25-Watts max on the 440-MHz band. See photo at www MFJEnterprises (dot) com . Call order at 601-323-5869 or -0549. 73 and good luck, from W2OR.
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