Elastic solid antennas are considered. It is shown that many body coherence effects lead to cross sections for pulses, much larger than earlier estimates. For monochromatic continuous signals, the new approach gives the same cross sections as derived in 1960.
A new method for data recording and analysis is proposed. This gives bandwidths several orders larger than are available by recording the output of an optimal filter.
Means are suggested for cascading half acoustic wavelength antennas to give increased cross sections.
Very low temperatures offer methods for selection of antenna quantum states, which imply that the signal to noise ratio can be increased beyond any presently conceived limit.