Bertho,
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You probably meant "VHF", right?? Not VFH ("very frequency high"?).? But this might be a non-English language issue, if English is not your preferred language.
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It is only somewhat right that the pager uses the human body as its antenna.? The antenna system includes both what's inside the pager and the effect of its environment including the human.? You can't fully separate one from the other.? That would be like saying that a Yagi antenna consists of just the longest wire, and it happens to have a bunch of other shorter wires nearby and then there's this dipole thingamajig that is in the way, between them.
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Every antenna has that "problem" of being part of its local environment, unless you can mount it in total isolation.? Dish antennas come close.
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Andy
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