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Amateur Radio Antennas - For discussion of all amateur band designed antennas and related accoutrements. This includes base, handheld, mobile and repeater usage. For commercial antennas on the amateur bands please use Commercial Radio Antennas below.

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Old 12-21-2017, 4:06 AM
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Join Date: Feb 2014
Location: Europe, Czech Republic
Posts: 78
Default Avoid the SainSonic INF-661 Antenna

Hi, just warning for others.

I recently bought the SainSonic INF-661 (36cm dual band antenna) for better performance of my Yaesu FT-65 HT. The antenna cost about USD 12 (incl. shipping).

I performed some test of this antenna using the KVE520 vector analyzer and the results were terrible. The antenna is complete crap. The SWR on 145MHz is 6,3 and on 438MHz it is even 12.5. On VHF, the antenna tunes a bit to SWR on 2.9 on VHF 152MHz and does not tune on UHF at all (all frequencies from 400 to 500MHz over SWR 10).

Don't buy this antenna, it is a complete crap, it will not work and you may burn your radio.
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Old 12-21-2017, 6:55 AM
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Join Date: Apr 2016
Posts: 185
Default Making good contact?

Looking at Amazon, 20 out of 22 reviews are 5 stars.
Just to throw it out there, are you sure the connector on the bottom of the antenna is "deep" enough to make a good connection to the radio? SMA's can get funny about that. An SMA antenna for one brand won't quite mate right with another brand radio.
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Old 12-21-2017, 7:06 AM
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Join Date: Feb 2014
Location: Europe, Czech Republic
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Default

Hi, if fact I bought two pieces, both have the same results.
But I didn't buy on Amazon, I bought it on eBay from here:
https://www.ebay.com/itm/SainSonic-I...o/181437179534
The antenna looks generic, but who knows? Didy any of the reviews on Amazon include some SWR measurements?
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