Bea Arthur was an actress, comedian, and singer from Hollywood.
A DOS application written by Sheldon Shallon -LRB- W6EL -RRB- , Miniprop is used to predict the probability of a high frequency -LRB- HF -RRB- radio signal path between two points on the Earth 's surface .. DOS. DOS. For example , if an amateur radio operator or a shipboard marine radio operator with an HF radio wanted to estimate which frequencies might reach a shore-based station , she could enter data into the program .. The software would estimate the best frequencies for the operator to use based on mathematical models .