Q: up 25 or 30 foot
A: For that short a run you can use any inexpensive RF coax, (Radio Shack) even RG6 (yes 75 ohm TV coax, it's not on a transmitter circuit so the balance and loss is negligible at that length, I have the same discone, it's very good, and hi-gain uhf yagi on RG6 both on 80 ft run) You'll need freq's too click your state and county and nearby counties, http://www.radioreference.com/apps/db/ Now if you want to go a little farther there is 2 good ways to use the FCC's search tool, you don't need to buy any books for frequencies these have it all First Go here and do a "point radius" search, put in your latitude and longitude and say 25 miles to start, start small if you are in a heavily populated area, this will return anything that is licensed, so it can be a lot of data http://fjallfoss.fcc.gov/General_Menu_Reports/engineering_search.cfm?accessible=NO Second Go here and put in "just" your zip code (or nearby one) this will return anything in that zip code, then click on the callsign on the left side to get all the info , antenna location, owner, frequency and so on, this too will return anything licensed so it may be a lot http://fjallfoss.fcc.gov/General_Menu_Reports/license_search.cfm Here are the 22 frequencies for those frs/gmrs radios that are all over, the ones on hangcards in Walmart/K-Mart http://www.walkie-talkie-watch.com/frs-gmrs-frequency.html Here's the other kids fm walkie talkies and "babysitters" the sitters usually have an agc circuit that turns up the gain when the ambient sound level is low, they can sometimes pick up other areas of the house too...... 49.830 49.845 49.860 49.875 49.890 You can get the "drive thrus" at fast food places, all kinds of stuff, if it has an antenna just google the name of the device with the word frequencies