In an example, an electronic device includes a first antenna and a second antenna. The electronic device may further include a power modulator to determine a simultaneous operation of the first antenna and the second antenna. The power modulator may monitor a first signal parameter of the first antenna and a second signal parameter of the second antenna. Upon monitoring signal parameters of respective antenna, the power modulator may dynamically regulate a first transmission power of the first antenna and a second transmission power of the second antenna based on the first signal parameter, the second signal parameter, and a threshold transmission value.