All of a sudden we can't pick up not one channel

Easy. First put up a good outside or wall antenna. Then run a coax cable (not flat lead wire) from the antenna to the tv. To do this you need to get a "balum" to go from the antenna to the coax wire. It's a small plastic 'transformer' (( about the size of your pinky finger)). The other end of the coax wire should have an 'F' connector put on it so it can screw into the F connection on the back of the tv set. Then get your remote and go to the input of your tv and change it to antenna input. Then do a channel scan. Let it finish scanning and it will let you know how many channels it picked up. If you're in a big city then you may pick up as many as 100 or more channels. If you're in the country, you may only pick up about 5 channels! If you need more channels then go back to Home Depot or Lowes and get an 'antenna amplifier'. Hopefully one that has about 25db gain. Most only have about 10db gain but the higher the number the better. It should be put inline between the tv and the antenna so you'll need another coax cable for the amplifier to the tv. The wire that comes from the antenna goes directly to the 'input' of the amplifier. Then from the 'output' of it to the tv. You'll love it once it's done and it's cheaper than cable or any other paid service!

It is possible that the cable to your antenna is broken somewhere. You have the right idea to start there.
It is also possible that your TV is looking at CABLE instead of AIR, or visa versa.

Hi. you mean receiving good image with a poor antenna ? Mostly one tends to use areal amplfiers. These however are no miracle devices. If your signal is weak (say, less than 10-20 µV) the amplifier's signal /noise ratio makes it even worse. The best 'amplifier' is still a good losless , as short as possible coax cable between the antenna and the receiver.

No.Tv can't pick up any reception or receive any free AIR broadcasting tv channels at all if tv have no antena hook up to a tv.Buy a better antena design to used like a Digital atenna,will solved this problems.

These types of antenna have poor reception, but should pickup local channels. Check the back of your receiver to make sure the coax is pushed all the way in, and hasn't fallen out. For better reception you could replace the aerial with a mounted aftermarket one. Hope this helps.

Can only be the coax input to the radio. Often the fault is that the soldered end is faulty at either the radio or the aerial end. If you have a voltmeter, check for shorts by putting each cable to the inner and outer coax wires. They should not be touching. If they are and the two ends are clear of each other it is likely a cracked cable inside. The easiest fix is to just use 12V wire or coax - as long as the two coax plugs are connected to the inner and outer, you will get a connection the the aerial. If you are getting ZERO reception then it is likely the cable is shot. Even if the aerial isnt connected, the cable itself should act as an antenna.

You should check the coax cables for damage . ALso, did you attach the PL-259 connectors yourself to the coax cables? They can be tricky. You need to check for loose or bad connections between coax cable and connector.
Of course it could be the radio itself went bad on you. Check this with a friend; when you connect his radio to your antenna system, does everything work then? Hope this helps.

do you have antenna or cable? if you have antena hook directly to the coax, go to menu, TV, tuner and pick antenna and scan. If you have cable hook directly to your coax repeat the previous step but pick cable instead of antenna. Notice if you have a cable box, you will not need to scan for channel since it will be on channel 3, 4 or any other input you may use.

I notice that on mine, the positioning of the included tv antenna is very, very, very finicky. I also don't know how to "add" a new channel other than to hook it to the big house antenna and pick "re-scan" (or auto-scan or whatever it's called).

So I think your best bet is to pick a better antenna or know that even the tiniest fiddling with the antenna makes a diff. Sometimes, I even have the antenna horizontal (using the magnet) to get the good reception on a given channel. Seems like a hassle except that what should I expect from a tiny antenna....