The fix for the problem is simply go to Radioshack and purchase their part number 278-267 which is an "F" jack to 1/8" Male Plug. The cost is $6.09. This should solve your problem. The 75-Ohm antenna plug can now be screwed or connected to the "F" connector.
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Your stereo came with a piece of wire attached at the back. This is/was the FM aerial. It should be roughly 1 metre or approx 38" long. There is no socket on the back of this stereo to attach an external FM aerial. So if the wire broke off then you're going to have to either attach some new wire to the stub, or open the set up and solder directly to the circuit board.
The exact cable lengths for an FM antenna to pick up 88-108 MHz is 37.66" long.
Radio Shack has an adapter catalog number 278-0291. It takes some effort to push the 278-0291 adapter onto the FM UNBL 75 ohm terminal so wait until you have the 278-0291 installed before you connect your 75 ohm coax on to your new adapter.
This will resolve your FM screw on F connector antenna interface issue.
I see others trying to help suggest using a 300 ohm to 75 ohm transformer match unit, this isn't what is needed. Your receiver antenna input IS a 75 ohm input.
The simple $7 dipole is a "twin lead" 300 ohm type that many home stereos shipped with because they are inexpensive, take up little room in the box and work surprisingly well for all but the very distant of stations. These antennas are also found for sale in many department and some hardware stores too. Your stereo may not offer twin lead or 300 ohm hook ups (2 terminal screws near the ANT label) but only a 75 ohm connection (like your cable tv connections), in which case, you'll need an inexpensive 300 to 75 (terminal to cable) ohm balun (or matching transformer) like this one below:
the antenna is internal (I couldnt find an external adapter) - u need to open the top (20 or so screws). Theres a "pipe" thru the back that leads pretty straight into the antennae. Hook ur metal to the closest bundle and out the pipe.
My reception still isn't perfect, but you can listen to it. I moved the ac power code to the far side and gain some improvement as well.
Looking at Sharp's site, you have a 3 pin plug that goes into the rear of the unit. the top pin is FM the middle and bottom are AM. You can get female "bullet" connectors and make your own if you wish. Or you can order it from Sharp. Probably under 20. Hope this helps
Having paid over $1,800 for 3 Bose Wave systems in the past year, I was surprised and quite dismayed to find that Bose is trying to squeeze a few more bucks out of me in order to provide some very simple information. My Solution: I will never purchase another of your radios. Most humbly, Dr. Jerome Eldridge
P.S. You might wish to upgrade your PR Department
There was a black wire included (with a metal "cap" to insert in the FM center connector) that served as the FM antenna, but in a pinch any wire can do, preferably about 33" long and with the insulation stripped from the last inch or so (or get creative and sand the last inch of varnish off a properly sized untwisted clothes hanger and gently bend to suit). Bare stranded wire should be twisted or folded until it's thick enough to firmly fit the middle "hole" of the FM antenna connector. Be careful that no strands of wire short to the metal ground "ring" surrounding the hole or the antenna won't work (although it won't burn out your amp like shorting the speaker wires would, it just won't work). Orient the wire horizontally or vertically for best reception. This unit also doesn't pick up FM very well if you're in a steel-framed building or away from windows in the general direction of the local transmitters, so moving the unit closer to a window may help dramatically. In bad reception areas you can get an external FM "rabbit ears" type antenna but you'll need the "European" style of 300 ohm to 75 ohm transformer to plug it into the unit's FM connector (one that has a bigger central connector "plug" than the usual US units). Some cable systems also still support FM, if yours does, a VHF/UHF/FM signal splitter and either the above mentioned transformer attached to flat 300 ohm cable or a plain "European" style connector attached to the end of the 75 ohm round black cable will do the trick. Some Radio Shacks have them. Good luck!