Is the incoming signal OTA or cable? (If cable, is it analog (CATV) or digital (QAM)?)
Most TV's do not have a video out but you should check your TV. Assuming the usual TV with no video out, then you will need a set top box to record any program other than analog signals (CATV or a low power OTA option). The VCR only has an NTSC (analog) tuner.
For an OTA signal, take the coax from the antenna to a digital-to-analog converter coax in, then coax out of the converter to the coax in (tuner) of the VCR. Then set the VCR to channel 3 or 4. Set the switch on the converter. (Some VCRs will record Line In or Input, so you could use the composite out of the converter to the VCR.) Then coax out from the VCR to the coax in on the TV and set the TV to Channel 3 or 4 as well. Set the switch on the VCR. (Alternatively use the composite (A/V) out on the VCR to the composite In on the TV and set the input to AV1 (or whatever the TV calls the input). Digital cable will be set up like the OTA, except for using a cable set top box instead. You may want a splitter to allow for watching one program while recording another. In that case, put the splitter before the set top box if the TV has the digital tuner. Otherwise put it after the set top box. In both cases, you will need to use the AV (composite out) on the VCR to the TV.
For analog cable, take the coax cable and connect it to the VCR's coax in. Then connect the coax out or AV out to TV.
Set the VCR to the desired station and press REC. For timed record, enter the menu and set the time to start and end the recording as well as the channel. If you are using a set top box, set that to the desired station and then press record. (Leave the VCR set to Line in or channel 3 (4) as needed.)
Manuals for some JVC vcrs are here: http://support.jvc.com/consumer/product.jsp?categoryId=CATG0002&productId=PRD4600001&archive=true
. A manual for a similar model will help since they all connect the same way. However the HR-D18OU is not in the list.
I hope this helps.