Sure it can. Phased shifted arrays of monopole antennas are often used to steer broadcast signals in a particular direction (If you've ever seen a group of 2-3

Sure it can. Phased shifted arrays of monopole antennas are often used to steer broadcast signals in a particular direction (If you've ever seen a group of 2-3 radio towers sitting close together in the country side, that's what they're doing). That said: if you're in the US and transmit outside of the ISM bands or at anything above about a few hundred milliwatts of power, you risk the FCC coming down on you with some hefty fines or jail time.