An input which is a standard cable TV Type F connector and requires the signal as a standard TV signal on channel 3 or 4 can never give you high definition - the old analog TV signal system does not have that bandwidth.
If you might want HD capability for the future, watch carefully for the type of input port. For example, some of the good TV tuner cards include video capture capability, with dedicated inputs for that. You could consider also a more complex and expensive card for other added functions. Now, IF you are looking ahead and thinking that you may want HD capture capability in future, plan you buying that way. Anything more than that is a software interpolation that exceeds the quality of the original signal. Virtually any analog video capture card that does NOT claim to provide HD will get you that resolution or higher in the file it captures. The resolution inherent in an analog NTSC Composite Video signal is roughly 640 x 460 or maybe 800 x 600 in computer video screen terms.
If all you are trying to capture is material from a VHS VCR via an NTSC Composite Video plus Stereo Audio line, you do not need HD capability.
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