Antenna input is shorted - Garmin GPSMAP 182C GPS Receiver

just use the same input port where the cable carrier used to connect or if the tv has another input marked aerial antenna [symbol looks like an inverted triangle (base up) with a short vertical line at the bottom of the triangle].

Check the input cable to dish box for firmness and the orientation of the dish.

An antenna is analog. Try using the setup menu for the tv to choose analog input.

This amp can be used with an off-air antenna or a cable box (up to channel 141).

With an antenna: Connect your antenna to the input. Connect the output to the tv's RF (antenna) input (if you're only driving one tv from this amp), or a splitter (if you're driving several tv's).

With a cable box: Connect the feed from the cable company to the amp's input. Connect the output to the input of the cable box.

Some laptops may have a direct input for the Wifi antenna......you have to check with the manufacturer of the laptop if you dont see an input jack for an antenna. Usually those antennas are built into the laptop internally.

Make sure you are connecting the digital antenna to the digital antenna input on the back of the set, then rescan. Most over the air Tv signals migrated to digital transmission and therefore the analog input is mostly for older analog devices. If you still do not get any channels, then you need to make sure the antenna you are using is rated for reception in your area. You can check for proper antenna size and channels available here,http://www.antennaweb.org/aw/welcome.aspx

did you switch the TV's incoming signal to digital antenna? For the cable box it was probably set to cable antenna or analog inputs, not all TV's have automatic switching for antenna feeds. My Mitsubishi has 1 digital and 1 analog antenna input and the cable box will only work through the antenna input if it's the analog antenna input and it's tuned to channel 3 or 4, -(or through a seprate HDMI, PROSCAN, SVCR,or a yellow RCA plug input)- and when the analog antenna input is selected the TV will tune all analog cable channels that the cable service offers if a box is not used. likewise the TV will not tune any channels at all if it's set to digital antenna inputs. It will tune all local channels only when set to digital antenna inputs.

check the antenna cable it can be shorted, plug the cable in the correct input; and try again

A Portable TV uasually has a 3.5mm phone jack as the antenna input, if you can't find the proper matching adaptor, try to construct one using a 3.5mm plug & an antenna maching transformer solder each side with short lenght of 75 ohn coaxial cable

contact garmin sounds like a defective unit