This dipole should easily give you 3dB gain max.
I pulled about 8 Srilankan channels a month ago. (October until Feb in India, ot should be possible to get continuously with negligible noise).
And for now, this is the list that I get from all around.
89.6 MHz - Sky FM - Pollachi
90 MHz - Aalayam FM - Coimbatore
90.4 MHz - Radio Kothagiri FM - Kothagiri
90.8 MHz - Rathnavani - Community FM - Coimbatore
91.1 MHz - Radio City - Coimbatore
91.9 MHz - Radio City - Madurai
92.7 MHz - Big FM - Mysore
92.7 MHz - Hello FM - Erode (After 10 pm)
93.5 MHz - Suriyan FM - Coimbatore
94.3 MHz - Club FM - Cochin
95 MHz - Red FM - Trissur
98.3 MHz - Radio Mirchi - Coimbatore
100.3 MHz - AIR Karaikal - Karaikal
100.5 MHz - Kodai FM - Kodaikanal
100.6 MHz - AIR Akashavani - Mysore
101.1 MHz - AIR Akashavani - Thrissur
101.8 MHz - AIR Akashavani - Ooty
102.3 MHz - AIR Kochi
102.5 MHz - AIR Akashavani - Dharmapuri
102.7 MHz - AIR Manjeri
103 MHz - AIR Akashavani - Coimbatore
103.3 MHz - AIR Madurai - Madurai
103.7 MHz - AIR Yercaud - Yercaud
104 MHz - Radio Mirchi - Cochin
104.8 MHz - Club FM - Alapuzha
106.4 MHz - Hello FM - Coimbatore
107.4 MHz - TNAU - FM - Coimbatore
107.5 MHz - AIR Akashavani - Cochin
107.8 MHz - PSG Tech - Community FM - Coimbatore
I have given the diagram for the SMALL 5 antenna.
https://www.hifivision.com/threads/small-5-yagi-antenna-for-fm-reception.98951/
If you have space to install one, you can easily make one to pull channels that are farther than 250km very easily. And a gain upto 9dB is guaranteed.
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