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An antenna specifically designed for GMRS would typically be tuned for the middle of the band. Maybe somewhere around 464 MHz. But, a lot depends on the design of the antenna and it’s bandwidth. If you were making your own antenna or tuning one on your own, you might choose to favor the repeater section of the band if you exclusively used repeaters. On the other hand, if you only use simplex you would probably favor 462 MHz. I also wanted to note, though I have never used one, the Midland antennas have not gotten particularly good reviews on this forum. You might wish to look around and see what other antennas people have liked and then pick something that meets your radio and financial needs. But, keep in mind there is no particular advantage to using a Midland antenna with a Midland radio.

While the information above is useful - there is no correct answer to whether the FCC considers GMRS to be wideband or narrowband. The FCC simply does not care which bandwidth you use, either one is acceptable to them. Most high profile repeater systems do use wideband - for the increased performance noted above. There are valid reasons why people might want to use narrowband, mainly due to available equipment or interference.