UKHeart Hertfordshire
FM
On the map
Where Heart Hertfordshire is radiated from — 3 transmitters [V], Ofcom's published positions. This says nothing about how far the signal reaches; it is not a coverage map.
FM
| Transmitter | Nation | Frequency | ERP (H) | ERP (V) | Height | RDS name | PI code | Area |
|---|---|---|---|---|---|---|---|---|
| Old Knebworth | England | 106.7 MHz | — | 100 W | 16 m | HEART_Ht | C360 | Stevenage |
| Cole Green | England | 106.9 MHz | 60 W | 250 W | 20 m | Heart_ht | C360 | Hertford |
| Letchworth - Briar Patch Lane | England | 106.9 MHz | — | 50 W | 10 m | HEART_HT | C360 | Hitchin and Letchworth |
Radiation pattern
Old Knebworth publishes the strongest FM signal for this station with a shape on record — where it is carried elsewhere too, this is not necessarily theirs.
Radiates most strongly toward the north (0°), as published by Ofcom.
More detail
Each ring is 10 dB of attenuation below the pattern's own peak; the outer rim is the peak itself and anything 30 dB down or deeper is drawn at the centre rather than off the edge of the chart, so a very deep null reads as “weak” and not as a hole in the picture. The shape says which direction radiates harder relative to the mast's own peak, not the absolute field strength there or how far it reaches — that is what the coverage map and the postcode lookup are for.