Give you a statement and table with its title in Markdown format, please determine whether the statement is supported or refuted by, or is unrelated to the table. It'a binary classification problem, you should choose the answer between supported and refuted. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| callsign | area served | frequency | band | freq currently | purpose |
| 5al | alice springs | 1530 | am | 8al (783 khz) | national |
| 5dr | darwin | 1500 | am | see 8dr | national |
| 8dn | darwin | 1242 | am | 8tab (hpon) | commercial |
| 8dr | darwin | 0 657 | am | 8rn | national |
| 8kn | katherine | 0 639 | am | 8rn | national |
| 8tc | tennant creek | 0 684 | am | 8rn | national |
Title:
list of radio station callsigns in the northern territory
Statement:
the purpose of the frequency used to service the area of katherin is national
Answer:
supported