In my area, there is a P25 system which continues to expand and has 13 towers within my county alone. The multipath from overlapping signals on the same frequency makes reception annoying and often unintelligible in mobile or portable listening. I have tried various adjustments to my Whistler and Uniden scanners without much results and, for base operation, I tried various outdoor and indoor antennas including a paper clip. None of this accomplished much to eliminate the multipath. I took an old UHF antenna and cut the driven element to 800 Mhz and mounted it vertically.. This helped a fair amount. Then I bought a 7 element Chinese UHF yagi for 11 bucks on a very popular auction site. I mounted the antenna at 17 feet and aimed it at a tower 1.5 miles away. The reduction in multipath is unbelievable.Signals are very intelligible now. Signal strength is not the issue. There is about 10 Db gain but the improvement in directivity and rejection of signals from the rear of the antenna makes all of the difference. You can certainly buy better antennas. The director elements of this unit are not riveted and the rear antenna mount is made of bendable aluminum. I used a u bolt mount that actually bites the mast immediately below this antenna for stability. You can certainly build your own antenna using PVC pipe and coat hangers and add more elements for greater directivity.