A method of evaluation of the directivity of gravitational wave (GW) radiators is given in the form of general equations applicable to most cases such as Weber's apparatus and the travelling wave (TW)‐type radiator (the latter proposed by one of the authors). Although it is not generally accepted now, Einstein's weak‐field theory is used for evaluating both near and distant fields. In a numerical example, using our general formula, the TW‐type radiator is considered and it is found that a half‐power angle width of ±5.3° is feasible using a crystal 30 cm in length. Intensity comparison is also made between the resonance vibrator and TW‐type radiators. Under reasonable assumptions, the radiated power of the latter is about 1023times larger than the former—that means 1040times higher intensity than the spinning rod first considered by Einstein as a GW source