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You can mount the antenna in your attic, basement, bedroom, or wherever you prefer to tune in. The connection cable at 10 feet makes it easy to mount the antenna where you prefer to listen. This antenna will work great indoor and can be mounted with the magnetic base. You can also purchase the Bingfu antenna with an SMA female or male connection. The double spring oscillator provides a great steady connection for this BNC scanner antenna. I can't recall if the old BC-III models used the funnel shaped telescopic antenna nuts yet or just a plain old nut.1 – Bingfu VHF UHF Ham Radio Police Scanner Antenna – Best Cheap Option Those were all 6-32 and if that's the correct size, it should screw into the antenna socket on the board of your BC-III easily for sizing purposes. You could probably figure out the size pretty easy if you have a screw from say an duplex electrical receptacle or light switch that was used to fasten the receptacle or switch to the box. I still can't remember if it was 4-40 or 6-32 but I doubt it was metric as I never really had to mess with any metric stuff back in the late 70's or early 80's. I had that 220 open a while back and noticed I'd soldered a nut in the old funnel shaped nut's place directly on the PCB! They were aluminum and somehow I'd cross threaded mine and ended up ripping it off of the board. I once buggered up one those old funnel shaped threaded antenna sockets they used on a lot of the newer Electra programmable models like those from the old BC-220 era. And they were perfect as one was VHF-LO and the other had both VHF boards installed in it from the factory. They had very cheap buy it now prices as well which I don't recall anymore but they were cheap. I'd found the old unopened BC-III's on an eBay auction a long time ago. Yes, I still use a pair of BC-III's today for our VHF Low Band state patrol's backup system and another for some of the local VHF High railroad frequencies.
